Face rest shielding for retinal imaging system

Abstract

A retinal camera and related methods of use are described. In an example, the retinal camera comprises a lens tube that moves along a first axis and a second axis to align with an eye to capture an image of the eye through the lens tube; and a face rest adapted to steady a head when capturing the image; and an adjustable curtain disposed inside the retinal camera to conceal internal components of the retinal camera from being visible through the face rest. In an example, the lens tube protrudes through the adjustable curtain. In an example, the adjustable curtain comprises a first adjustable mechanism that permits the lens tube to move along the first axis; and a second adjustable mechanism that permits the lens tube to move along the second axis

Description

FACE REST SHIELDING FOR RETINAL IMAGING SYSTEMCROSS REFERENCE TO RELATED APPLICATION

[0001] This application claims the benefit of US Provisional Application No. 63 / 708,348, filed Oct. 17, 2024, the contents of which are hereby incorporated by reference.TECHNICAL FIELD

[0002] This disclosure relates generally to shielding for a face rest, and, in particular but not exclusively, relates to shielding for a retinal imaging system.BACKGROUND INFORMATION

[0003] Retinal imaging is a part of basic eye exams for screening, field diagnosis, and progress monitoring of many retinal diseases. A high-fidelity retinal image is important for accurate screening, diagnosis, and monitoring.

[0004] However, stray light from outside the retinal imaging system can deteriorate retinal images. Further, dust, dirt, and moisture within the retinal imaging system can degrade the retinal imaging system over time and degrade retinal imaging. Additionally, there is a need to protect the internal camera system from the entry of larger foreign objects or accidental contact with fingers, for example.BRIEF DESCRIPTION OF THE DRAWINGS

[0005] Non-limiting and non-exhaustive embodiments of the claimed subject matter are described with reference to the following figures, wherein like reference numerals refer to like parts throughout the various views unless otherwise specified. Not all instances of an element are necessarily labeled so as not to clutter the drawings where appropriate. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating the principles being described.

[0006] FIG. 1A is a front view of a retinal camera, in accordance with an embodiment of the present disclosure.

[0007] FIG. IB is a partial view of the retinal camera of FIG 1A showing the face rest and some internal components of the retinal camera, in accordance with embodiments of the present disclosure.13960-P402WO

[0008] FIG. 2A is a perspective view of an adjustable curtain of a retinal camera, in accordance with an embodiment of the present disclosure.

[0009] FIGS. 2B and 2C are top-down plan views of the adjustable curtain of FIG. 2A, in accordance with an embodiment of the present disclosure.

[0010] FIG. 2D is an illustration of an adjustable curtain for a retinal camera, in accordance with an embodiment of the present disclosure.

[0011] FIG. 3A is a partial perspective view of an adjustable curtain of a retinal camera, in accordance with an embodiment of the present disclosure.

[0012] FIGS. 3B and 3C are top-down plan views of the adjustable curtain of FIG. 3 A, in accordance with an embodiment of the present disclosure.

[0013] FIG. 4A is a perspective view of an adjustable curtain of a retinal camera, in accordance with an embodiment of the present disclosure.

[0014] FIG. 4B is another perspective view of the adjustable curtain of FIG. 4A, in accordance with an embodiment of the present disclosure.

[0015] FIG. 4C is apartial exploded diagram of the adjustable curtain ofFIG. 4A, in accordance with an embodiment of the present disclosure.

[0016] FIG. 5A is a perspective view of an aperture assembly of a retinal camera, in accordance with an embodiment of the present disclosure.

[0017] FIG. 5B is another perspective view of the aperture assembly of FIG. 5A, in accordance with an embodiment of the present disclosure.

[0018] FIG. 5C is an exploded view of the aperture assembly of FIG. 5 A, in accordance with an embodiment of the present disclosure.

[0019] FIGS. 5D and 5E are cross sections of the aperture assembly of FIG. 5A, in accordance with an embodiment of the present disclosure.

[0020] FIG. 6A is a perspective view of an aperture assembly with a lens tube disposed therein, in accordance with embodiments of the present disclosure.

[0021] FIG. 6B is a partial isometric cross section of the aperture assembly of FIG. 6A, in accordance with embodiments of the present disclosure.

[0022] FIG. 6C is another partial isometric cross section of the aperture assembly of FIG. 6A, in accordance with embodiments of the present disclosure.

[0023] FIG. 7A is a functional component diagram illustrating a retinal imaging system with a subject interface for accommodating a face of a subject, in accordance with an embodiment of the disclosure.23960-P402WO

[0024] FIG. 7B is another functional component diagram of the retinal imaging system of FIG. 7A. in accordance with an embodiment of the disclosure.DETAILED DESCRIPTION

[0025] Embodiments of face rest shield or curtain for a retinal camera are described herein. In the following description numerous specific details are set forth to provide a thorough understanding of the embodiments. One skilled in the relevant art will recognize, however, that the techniques described herein can be practiced without one or more of the specific details, or with other methods, components, materials, etc. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring certain aspects.

[0026] Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0027] As discussed further herein, stray light, dust, dirt, and moisture can tend to degrade retinal image quality and retinal imaging system components.

[0028] To address these and related challenges, the present disclosure provides a retinal camera comprising an adjustable curtain or shield shaped or otherwise configured to seal internal components of the retinal camera from dirt, dust, liquids, and other objects, particles, and the like from entering the retinal camera, while also allowing alignment of optical or other imaging components of the retinal camera with an eye of a subject.

[0029] In this regard, attention is directed to FIGS. 1A and IB, in which a retinal camera 100 according to an embodiment of the present disclosure, is illustrated. FIG. 1A is a front view of the retinal camera 100. FIG. IB is a partial view of the retinal camera 100 showing the face rest 108 and some internal components 112 of the retinal camera 100.

[0030] In the illustrated embodiments, the retinal camera 100 is shown to include a lens tube 102, such as containing lenses and other optics (see FIGS. 7A and 7B) , a face rest 108 adapted to steady a head when capturing the image, and an33960-P402WOadjustable curtain 110 disposed inside the retinal camera 100 to conceal internal components 112 of the retinal camera 100 from being visible through the face rest 108.

[0031] As shown, the lens tube 102 protrudes through the adjustable curtain 110. In this regard, the lens tube 102 is configured to slidably move back and forth through the adjustable curtain 110 to adjust imaging optics fore and aft to align with the eye of the subj ect.

[0032] In FIG. IB, certain internal components 112 of the retinal camera 100 are shown, including the lens tube 102 and a curtain bracket 166. As discussed further herein, such internal components 112 are shielded, both from stray light and external objects, by the adjustable curtain 110.

[0033] As discussed further herein, the lens tube 102 is configured to move along a first axis and a second axis orthogonal to the first axis to align with an eye to capture an image of the eye through the lens tube 102. Correspondingly, the adjustable curtain 110 is configured to move along the first axis and the second axis with movement of the lens tube 102, while maintaining a seal between external and internal portions of the retinal camera 100 (such as inside of and outside of the case 178). As above and as discussed throughout the present disclosure, the adjustable curtain 110 is configured to move along at least the first axis and the second axis, wherein the second axis is orthogonal to first axis. In an embodiment, such axes, such as the first axis and the second axis, are perpendicular to one another. In this regard, movement along one of the axes is perpendicular to movement along a different axis. Because of such perpendicularity, movement along axes, allows the lens tube 102 to move about two- dimensional spaces (in the case of a first and second axes) and three-dimensional spaces (in the case of first, second, and third axes).

[0034] In an embodiment, and as described further herein, in an embodiment, the seal is a light-tight seal configured to prevent or limit light from outside the retinal camera 100 from entering into the retinal camera 100. Additionally, in an embodiment, the seal is configured to prevent or limit dust, dirt, liquids, and the like from entering into the retinal camera 100, such as into an interior portion of the case 178 housing the lens tube 102.

[0035] In various embodiments, the adjustable curtains of the retinal cameras comprise adjustable mechanisms that allow movement along orthogonal axes, such as to align the lens tube with the eye of the subject. In this regard, attention is directed to FIGS. 2A-2D in which adjustable curtains 210, according to embodiments of the43960-P402WOpresent disclosure, are illustrated. FIG. 2A is a perspective view of the adjustable curtain 210 of a retinal camera, in accordance with an embodiment of the present disclosure. FIGS. 2B and 2C are top-down plan views of the adjustable curtain 210.

[0036] In an embodiment, the adjustable curtain 210 is configured to be used in retinal cameras described herein, such as retinal camera 100 described herein with respect to FIGS. 1A and IB.

[0037] As discussed further herein with respect to FIGS. 1 A and IB, the retinal cameras of the present disclosure comprise a lens tube, a face rest, and an adjustable curtain. Referring again to FIGS. 2A-2D, the lens tube is configured to move along a first axis 204 and a second axis 206 to align with an eye to capture an image of the eye through the lens tube. As shown, the first axis 204 is orthogonal to the second axis 206.

[0038] The adjustable curtain 210 is shaped and otherwise configured, such as with various adjustable mechanisms, to move along orthogonal axes to allow movement of the lens tube to align with the eye. In this regard, the adjustable curtain 210 can include a first adjustable mechanism 214 that permits the lens tube to move along the first axis 204; and a second adjustable mechanism 216 that permits the lens tube to move along the second axis 206. As the adjustable curtain 210 is able to move independently along the first axis 204 and the second axis 206, the adjustable curtain 210 is able to move a lens tube to points on a plane defined by such orthogonal axes 204 and 206. Additionally, as discussed further herein with respect to FIGS. 5 A- 5E, the adjustable curtains according to the present disclosure can further permit movement along a third axis (see third axis 560), such as to permit movement of the lens tube throughout a three-dimensional space, such as to align the lens tube with an eye of the subject.

[0039] As shown, the adjustable curtain 210 comprises a plurality of panels 218. The panels 218 of the plurality of panels 218 are shown arranged with panels 218 positioned in an alternating arrangement, such as to define an accordion bellows 220. In the illustrated embodiment, panels 218 of the plurality of panels 218 are shown to face altematingly in a first and second direction. In an embodiment, the plurality of panels 218 comprises hinged individual rigid panels 218.

[0040] As shown in FIGS. 2B and 2C, the accordion bellows 220 is shaped to compress or expand through hinged pivoting between coupled adjacent panels 218 of53960-P402WOthe plurality of panels 218. In this regard, the adjustable curtain 210 is configured to allow movement of the lens tube along a first axis 204.

[0041] In the illustrated embodiment, the adjustable curtain 210 is shown to comprise a plurality of pins 222 hingedly coupling adjacent panels 218 of the plurality of panels 218. As used herein, hingedly coupling refers to coupling of two or more structures through a hinge, such as to allow rotation about that hinge when coupled. Such pins 222 allow adjacent panels 218 to fold and unfold to allow movement along the first axis 204.

[0042] The adjustable curtain 210 is also shown to include an aperture assembly 248 defining an aperture 250 shaped and positioned to slidably receive lens tube. In an embodiment, the aperture assembly 248 is configured to allow the lens tube, slidably received therein, to move along a second axis 206, such as to align or focus the lens tube with the eye of a subject.

[0043] As shown, the adjustable curtain 210 allows movement along the first axis 204 and the second axis 206, such as through expansion and contraction or folding and unfolding of adjacent panels 218. Further, the adjustable curtain 210 blocks from view- objects behind the adjustable curtain 210 as the lens tube moves along the first axis 204 and the second axis 206. In this regard, internal components, such as internal components 112 discussed further herein with respect to FIG. 1C, remain concealed as the lens tube moves along the first axis 204 and the second axis 206.

[0044] The adjustable curtain 210 is shown to further comprise curtain bracket 266 shaped to guide curtain movement along the first axis 204. In this regard, the curtain bracket 266 comprises a slot 268 shaped to receive a portion of the adjustable curtain 210. As shown, the adjustable curtain 210, such as the plurality of pins 222, is slidably received in the slot 268 to allow' translation of adjustable curtain 210 along one of the first axis 204 and the second axis 206.

[0045] The embodiments of FIGS. 2A-2C are shown to include a plurality of panels 218, where the panels 218 are physically separate and distinct panels 218. However, adjustable curtains comprising a plurality of panels 218 formed from a singular piece are possible and within the scope of the present disclosure. FIG. 2D is an illustration of an adjustable curtain 210 for a retinal camera, in accordance with an embodiment of the present disclosure, where the adjustable curtain 210 comprises molded or extruded polymeric piece 226 comprising the plurality of panels 218. Such molded or extruded accordion bellows 220 allow movement along a first axis 204,63960-P402WOsuch as through expansion or contraction of adjacent panels 218 as discussed with respect to FIGS. 2A-2C, but through bending of creases or comers in the singular molded or extruded accordion bellows 220, rather than about separate pins 222 as in FIGS. 2A-2C. In an embodiment, the polymeric piece 226 is a co-extrusion of two or more materials, such as to provide more flexible sections at hinges between panels 218.

[0046] In an embodiment, the adjustable curtain 210 comprises plurality of panels 218; and a fabric sleeve defining a plurality of slots shaped to receive, such as individually receive, panels 218 of the plurality of panels 218. Expansion and contraction of adjacent panels occurs through the folding and unfolding of the fabric in between panels.

[0047] The illustrated accordion bellows 220 provides a number of noted advantages including, but not limited to, a compact overall size (particularly along axis 204), accordion areas are generally sealed and limit dust or other particulate ingress, and are generally light tight. Additionally, the accordion bellows 220 provides relatively fewer sliding interfaces and more pivots for relatively less wear and friction.

[0048] In an embodiment, the retinal cameras of the present disclosure comprise adjustable curtains comprising telescoping shutters. In this regard, attention is directed to FIGS. 3A-3C in which an adjustable curtain 310, in accordance with embodiments of the present disclosure, is illustrated. FIG. 3A is a partial perspective view- of the adjustable curtain 310. FIGS. 3B and 3C are top-down plan views of the adjustable curtain 310.

[0049] In an embodiment, the adjustable curtain 310 is suitable for use in a retinal camera according to an embodiment of the present disclosure, such as in the retinal camera 100 described further herein with respect to FIGS. 1 A and IB.

[0050] As discussed further herein with respect to FIGS. 1A and IB, the adjustable curtains 310 of the present disclosure can include a first adjustable mechanism 314 that permits a lens tube of a retinal camera to move along the first axis 304; and a second adjustable mechanism 316 that permits the lens tube to move along the second axis 306. As shown, the first axis 304 and second axis 306 are perpendicular to one another.

[0051] Regarding the first adjustable mechanism 314, the adjustable curtain 310 is shown to comprise a plurality of panels 318. In the illustrated embodiment, the adjustable curtain 310 comprises telescoping shutters 328 comprising73960-P402WOthe plurality of panels 318. In this regard, adj acent panels 318 of the plurality of panels 318 are cooperatively coupled. Further, panels 318 of the plurality of panels 318 are arrayed in a direction along the second axis 306, such that adjacent panels 318 are disposed relative to one another along the second axis 306. As shown, the plurality of panels 318 comprising the telescoping shutters 328 define sliding interleaved shutters permitting motion along the first axis 304.

[0052] In the illustrated embodiment, each panel 318 of the plurality of panels 318 is shown to define a primary panel face 330; a first tab 332 extending from the primary panel face 330 in a first direction 334, and a second tab 336 extending from the primary panel face 330 in a second direction 338 opposite the first direction 334. In this regard, panels 318 of the plurality of panels 318 define a z shape.

[0053] The telescoping shutters 328 are cooperatively coupled to allow movement along a first axis 304, such as where panels 318 of the plurality of panels 318 slide relative to one another. Moreover, the cooperative coupling, such as through the first tab 332 and the second tab 336 on adjacent panels 318, provides a light seal, which blocks or mitigates light from passing through the adjustable curtain 310 and into a retinal camera.

[0054] As shown, the adjustable curtain 310 comprises a curtain bracket 366 defining slot 368 shaped to receive a portion of the adjustable curtain 310, such as where the adjustable curtain 310 is slidably received in the slot 368 to allow translation of adjustable curtain 310 along the first axis 304. In the illustrated embodiment, the curtain bracket 366 comprises a plurality of slot 368 shaped and positioned to receive panels 318 of the plurality of panels 318. As shown, the telescoping shutters 328 comprise the plurality of panels 318 disposed at varying positions along the second axis 306. The curtain bracket 366 is shown to include slots 368 positioned to receive individual panels 318 arrayed at such varying positions along the second axis 306.

[0055] Regarding the second adjustable mechanism 316 of the adjustable curtain 310, the adjustable curtain 310 is also shown to include an aperture assembly 348 defining an aperture 350 shaped and positioned to slidably receive lens tube. In an embodiment, the lens tube is shaped and otherwise configured to allow movement of the lens tube through the aperture 350 and along the second axis 306.

[0056] The telescoping shutters 328 provide a number of noted advantages including, but not limited to, a compact overall size (particularly along first axis 304),83960-P402WOa rigid puncture-resistant structure, a low total number of parts, and a generally light tight seal.

[0057] In an embodiment, the adjustable curtains of the present disclosure comprise a tambour. In this regard, attention is directed to FIGS. 4A-4C in which an adjustable curtain 410 comprising a tambour, according to embodiments of the present disclosure, is illustrated. FIG. 4A is a perspective view of the adjustable curtain 410. FIG. 4B is another perspective view of the adjustable curtain 410. FIG. 4C is a partial exploded diagram of the adjustable curtain 410.

[0058] In an embodiment, the adjustable curtain 410 is suitable for use in a retinal camera according to any embodiment of the present disclosure, such as retinal camera 100 discussed further herein with respect to FIGS. 1A and IB.

[0059] As discussed further herein with respect to FIGS. 1A and IB, the adjustable curtains of the present disclosure can include a first adjustable mechanism 414 that permits a lens tube to move along the first axis 406; and a second adjustable mechanism 416 that permits the lens tube to move along the second axis 404. As shown, the first axis 406 is perpendicular to the second axis 404.

[0060] Regarding the first adjustable mechanism 414, the adjustable curtain 410 is shown to comprise a tambour comprising a flexible sheet 440; and a plurality of panels 444coupled to the sheet. As shown, the plurality of panels 444 is disposed on a first side 446 of the flexible sheet 440, the adjustable curtain 410 further comprising a plurality of fasteners 418 disposed on a second side 442 of the flexible sheet 440 and coupled to the plurality of panels 444 and coupling the plurality of panels 444 to the flexible sheet 440. In the illustrated embodiment, the plurality of panels 444 and the fasteners 418 are cooperatively coupled through film apertures 482 defined by the flexible sheet 440.

[0061] In the illustrated embodiment, the adjustable curtain 410 is shown to further include curtain bracket 466 which holds a curved rail that has slot 468 shaped to receive a portion of the adjustable curtain 410. As shown, the adjustable curtain 410 is slidably received in the slot 468 to allow translation of adjustable curtain 410 along one of the first axis 404 and the second axis 406, here the first axis 404. The flexibility of the flexible sheet 440 allow s translation of the adjustable curtain 410 along the first axis 404 and as the slot 468 curves away from the orthogonal axis 404. In this regard, including the aperture assembly 448 shaped to receive a lens tube, such as through aperture 450, translates along the first axis 404, such as to align the lens tube with an93960-P402WOeye of a subject. Additionally, the curve in the slot 468 and the flexibility of the flexible sheet 440 permits a reduced overall footprint, especially in a direction of the first axis 404.

[0062] In an embodiment, the flexible sheet 440 is configured to block light, such as to prevent or to mitigate light from entering into or exiting from an internal portion of a retinal camera. Likewise, in an embodiment, the plurality’ of panels 444 and plurality' of fasteners 418are configured to block light, thus also preventing or mitigating light from entering into or exiting from such an internal portion of the retinal camera.

[0063] The curtain bracket 466 can also be shaped to couple to components of a retinal camera, such as an exterior housing of the retinal camera. (See. for example, case 178 discussed further herein with respect FIG. 1A). In this regard, the curtain bracket 466 can be securely coupled to the retinal camera to permit the lens tube to move relative to the adjustable curtain 410.

[0064] As discussed further herein, adjustable curtains of the present disclosure can include aperture assemblies, such as aperture assemblies configured to permit motion of a lens tube along at least one of a set of orthogonal axes. In this regard, attention is directed to FIGS. 5A-5E in which an aperture assembly 548, in accordance with embodiments of the present disclosure, is illustrated. FIG. 5A is a perspective view of the aperture assembly 548. FIG. 5B is another perspective view of the aperture assembly 548. FIG. 5C is an exploded view of the aperture assembly 548. FIGS. 5D and 5E are cross sections of the aperture assembly 548.

[0065] In an embodiment, the aperture assembly 548 is shaped and otherwise configured to fit within an adjustable curtain described further herein, such as with respect to any of FIGS. 2 A, 2B, 3A-3C, and 4A-4C.

[0066] As shown, the aperture assembly 548 defines an aperture 550, shown here shaped and positioned to slidably receive a lens tube 584. In this regard, the aperture 550 is shaped to permit a lens tube 584 to move along a second axis 506, where, for example, the adjustable curtain into which the aperture assembly 548 is integrated is further configured to move along a first axis 504 (see, for example, FIGS. 2A-2C). As shown, the first axis 504 is perpendicular to the second axis 506.

[0067] The aperture assembly 548 is shown to further comprise a pair of aperture brackets 554, a seal 552 comprising seal rails 586. and rails 580. In an embodiment, the seal 552 is shaped to provide a seal between the aperture103960-P402WOassembly 548 and the lens tube when the lens tube is slidably received by the aperture assembly 548. In an embodiment, the seal between the aperture assembly 548 and the lens tube slidably received therein is a light-tight seal, which prevents or limits light from entering between the lens tube and the seal. Additionally, in an embodiment, such a seal 552 may be also configured to prevent ingress of dust, dirt, moisture and the like between a lens tube and the seal 552.

[0068] In an embodiment, the aperture assembly 548 is configured to allow movement of the lens tube along a third axis 560. As shown, the third axis 560 is orthogonal to both the first axis 504 and the second axis 506. In the illustrated embodiment, the rails 580 and seal rails 586 are cooperatively coupled to the aperture brackets 554. In this regard, the seal 552 is also coupled to the aperture brackets 554 and configured to slide on the seal rails 586 along the third axis 560. This further permits the lens tube 584 to move along the third axis 560.

[0069] In an embodiment, the third axis 560 is orthogonal to a first axis and a second axis, such as of an adjustable curtain into which the aperture assembly 548 is integrated. See. for example. FIGS. 2A-2D, 3A-3C, and 4A-4C.

[0070] In an embodiment, the aperture assembly 548 permits misalignment of a central axis 562 of the aperture 550, such as defined by the lens tube 584, and a longitudinal axis of the lens tube. In the illustrated embodiment, the central axis 562 is shown to be co-linear with the second axis506. The seal 552 can permit misalignment of the central axis 562 and the longitudinal axis of the lens tube through, for example deformation of the seal 552. Such misalignment can allow, for example, the lens tube to point in directions that are not parallel to any of the orthogonal axes, which can be useful in aligning the lens tube with an eye of a subject. Additionally, such permitted misalignment can prevent or reduce binding of the lens tube as it moves through the aperture assembly 548, where such binding can limit movement of the lens tube.

[0071] In an embodiment, the seal 552 comprises a foam material, such as a deformable foam material. In an embodiment, the foam material is selected from Poron, EVA, Delrin, or PET. In an embodiment, the seal 552 comprises a material selected from foam, felt, rubber, cloth, and plastic. In an embodiment, the seal 552 comprises rollers, wheels, ball bearings, cartridge bearings, ball joints,

[0072] Another aperture assembly 648 according to embodiments of the present disclosure is illustrated in FIGS. 6A-6C. FIG. 6A is perspective view of the113960-P402WOaperture assembly 648 with a lens tube disposed therein. FIG. 6B is a partial isometric cross section of the aperture assembly 648. FIG. 6C is another partial isometric cross section of the aperture assembly 648.

[0073] In an embodiment, the aperture assembly 648 is shaped and otherwise configured to fit within an adjustable curtain described further herein, such as with respect to any of FIGS. 2 A, 2B, 3A-3C. and 4A-4C.

[0074] The aperture assembly 648 is shown to define an aperture 650 shaped and positioned to slidably receive the lens tube. As shown, the aperture assembly 648 comprises a seal 652 shaped to provide a seal betw een the aperture assembly 648 and the lens tube when the lens tube is slidably received by the aperture assembly 648. In an embodiment, the seal 652 is configured to conform to the lens tube and move with the lens tube, such as to provide a light-tight seal between the lens tube and the aperture assembly 648. In this regard, the aperture assembly 648 is shown to further comprise an aperture bracket defining a seal cavity 656 shaped to encompass an edge portion 658 of the seal 652 and to allow movement of the seal 652 within the seal cavity 656. While the seal 652 is sandwiched between the pair of aperture brackets 654, the seal 652 is permitted to float in directions orthogonal to the second axis 606. As discussed further herein with respect to, for example, FIGS. 2A-2C, the aperture assembly 648 can be integrated into an adjustable curtain, such as adjustable curtain 210, which can move along a first axis, such as axis 204.

[0075] In an embodiment, the seal 652 comprises a material, such as a seal material discussed further herein with respect to FIGS. 5A-5E.

[0076] FIGS. 7A and 7B are functional component diagrams illustrating a retinal imaging system 702 with a face rest 708, in accordance with an embodiment of the disclosure. The illustrated embodiment of retinal imaging system 702 includes the face rest 708, an illuminator 705, an image sensor 710 (also referred to as a retinal image sensor), a controller 715, a user interface 721, a display 725, alignment tracking camera(s) 730, and an optical relay system. The illustrated embodiment of the optical relay system includes lens assemblies 735, 740. 745 and a beam splitter 750. The illustrated embodiment of illuminator 705 comprises illuminator arrays 765 and a center aperture 755.

[0077] The retinal imaging system 702 can also include an adjustable curtain, such as an adjustable curtain described further herein with respect to FIGS. 1A, IB, 2A, 2B, 3A-3C, and 4A-4B, such as disposed within curtain bracket 766. The retinal123960-P402WOimaging system 702 can also include an aperture assembly, such as an aperture assembly described further herein with respect to FIGS. 5A-5E and 6A-6C, such as integrated within an adjustable curtain. As described elsewhere herein, such adjustable curtains and aperture assemblies permit movement of a lens tube and other optical components along orthogonal axes 704 and 706 to align the image sensor 710 with an eye of a subject.

[0078] The optical relay system serves to direct (e.g., pass or reflect) illumination light 780 output from illuminator 705 along an illumination path through the pupil of eye to illuminate retina while also directing image light 785 of retina (i.e., the retinal image) along an imaging path to image sensor 710. Image light 785 is formed by the scattered reflection of illumination light 780 off the retina. In the illustrated embodiment, the optical relay system further includes beam splitter 750, which passes at least a portion of image light 785 to image sensor 710 while also optically coupling fixation target 791 to eyepiece lens assembly 735 and directing display light 790 output from display 725 to eye. Beam splitter 750 may be implemented as a polarized beam splitter, a non-polanzed beam splitter (e.g.. 90% transmissive and 10% reflective, 50 / 50 beam splitter, etc.), a dichroic beam splitter, or otherwise. The optical relay system includes a number of lenses, such as lenses 735, 740, and 745, to focus the various light paths as needed. For example, lens 735 may include one or more lensing elements that collectively form an eyepiece lens assembly 735 that is housed within a lens tube (not illustrated in FIGS. 7A and 7B, see FIG. IB). The eyepiece lens 735 is displaced from the cornea of eye by an eye relief during operation. Lens 740 may include one or more lens elements for bringing image light 785 to a focus on image sensor 710. Lens 745 may include one or more lens elements for focusing display light 790. It should be appreciated that optical relay system may be implemented with a number and variety of optical elements (e.g., refractive lenses, reflective surfaces, diffractive surfaces, etc.) and may vary from the configuration illustrated in FIGS. 3 A and 3B.

[0079] In one embodiment, display light 790 output from display 725 represents a fixation target. The fixation target may be an image of a plus-sign, a bullseye, a cross, a target, or other shape (e.g., see demonstrative fixation target images 791). The fixation target not only can aid with obtaining fine or precise alignment between eyepiece lens 735 and the eye by providing visual feedback to the patient, but also gives the patient a fixation target upon which to accommodate and stabilize their133960-P402WOvision. Display 725 may be implemented with a variety of technologies including a liquid crystal display (LCD), light emitting diodes (LEDs), various illuminated shapes (e.g., an illuminated cross or concentric circles), or otherwise. Of course, the fixation target may be implemented in other manners than a virtual image on a display. For example, the fixation target may be a physical object (e.g., crosshairs, etc.).

[0080] The illustrated embodiment is shown to include a face rest 708 and a curtain bracket 766. As discussed further herein, such as with respect to FIGS. 2A. 2B, 3A-3C, and 4A-4C, the curtain bracket 766 can house an adjustable curtain configured to permit motion along two or more orthogonal axes, such as orthogonal axes 704 and 706, such as to align the image sensor 710 with an eye of a subject. In an embodiment, the adjustable curtain is an example of the adjustable curtains discussed further herein with respect to FIGS. 2A, 2B, 3 A-3C, and 4A-4C, or any other embodiments provided herein.

[0081] As shown, the retinal imaging system 702 is shown to include an alignment motor 746 configured to move the retinal image sensor 710 relative to the face rest 708. As also shown, the alignment motor 746 is operatively coupled to the controller 715. In operation, the controller 715 choreographs operation of the alignment motor 746 to move, with the alignment motor 746, the retinal image sensor 710 to align the retinal image sensor 710 with an eye of the subject; and obtain, with the retinal image sensor 710. an image of the eye. In an embodiment, such moving, with the alignment motor 746, the retinal image sensor 710 to align the retinal image sensor 710 with an eye of the subj ect through a lens tube (such as shown in FIG. IB).

[0082] Image sensor 710 may be implemented using a variety of imaging technologies, such as complementary metal-oxide-semiconductor (CMOS) image sensors, charged-coupled device (CCD) image sensors, or otherwise. In one embodiment, image sensor 710 includes an onboard memory' buffer or attached memory to store / buffer retinal images.

[0083] Alignment tracking camera(s) 730 operate to track lateral and ey e relief offset alignment (or misalignment) between retinal imaging system 702 and eye, and in particular, between eyepiece lens assembly 735 and eye. Alignment tracking camera 730 may operate using a variety of different techniques to track the relative position of eye to retinal imaging system 702 including pupil tracking, iris tracking, or otherwise. In the illustrated embodiment, alignment tracking camera 730 includes tw o143960-P402WOcameras disposed on either side of eyepiece lens assembly 735 to enable triangulation and obtain X, Y, and Z position information about the pupil or iris. In one embodiment, alignment tracking camera 730 includes one or more infrared (IR) emitters to track eye via IR light while retinal images are acquired with visible spectrum light, and in some cases, with IR light as well.

[0084] Eye position, including lateral alignment and / or eye relief offset alignment, may be measured and tracked using retinal images acquired by image sensor 710 for precise alignment tracking, or separately / additionally, by alignment tracking camera(s) 730. Alignment tracking camera(s) 730 provide coarse alignment tracking via the pupil or iris. In the illustrated embodiment, alignment tracking camera(s) 730 are positioned externally to view eye from outside of eyepiece lens assembly 735. In other embodiments, alignment tracking camera(s) 730 may be optically coupled via the optical relay components to view and track eye through eyepiece lens assembly 735.

[0085] Controller 715 is coupled to image sensor 710, display 725, illuminator 705. alignment tracking camera 730. and visual guidance indicator 701 to choreograph their operation. Controller 715 may include software / firmware logic executing on a microcontroller, hardware logic (e.g., application specific integrated circuit, field programmable gate array, etc.), or a combination of software and hardware logic. Although FIG. 7 A illustrates controller 715 as a distinct functional element, the logical functions performed by controller 715 may be decentralized across a number of hardware elements. Controller 715 may further include input / output (I / O ports), communication systems, or otherwise. Controller 715 is coupled to user interface 721 to receive user input and provide user control over retinal imaging system 702. User interface 721 may include one or more buttons, dials, feedback displays, indicator lights, etc.

[0086] During operation, controller 715 operates illuminator 705 and retinal image sensor 710 to capture one or more retinal images. Illumination light 780 is directed through the pupil of eye to illuminate retina 775. The scattered reflections from retina 775 are directed back along the image path through aperture 755 to image sensor 710. When the eye is properly aligned, aperture 755 operates to block deleterious reflections and light scattering that would otherwise malign the retinal image while passing the image light itself. Prior to capturing the retinal image, controller 715 operates display 725 and alignment tracking camera(s) 730 to provide153960-P402WOreal-time visual feedback to eye to achieve coarse alignment, at which point the user can see the fixation target. Controller 715 further operates display 725 to output a fixation target image 791 to guide the patient's gaze into fine or precise alignment. Once fine alignment is achieved, controller 715 deems the eye to be aligned with the retinal imaging system 702, and thus acquires a retinal image with image sensor 710.

[0087] In embodiments, operation can include moving, with the motor 746 of the retinal camera 702, a lens tube (such as lens tube 102) of the retinal camera 702 along one or more of a first axis 704 and a second axis 706 orthogonal to the first axis 704, thereby actuating a first adjustable mechanism (such as first adjustable mechanism 214) of the adjustable curtain (such as adjustable curtain 210) of the retinal camera 702 that permits the lens tube to move along the first axis 704; actuating second adjustable mechanism (such as second adjustable mechanism 216) of the adjustable curtain that permits the lens tube to move along the second axis 706; and aligning a retinal image sensor 710 with the eye; and obtaining, with a retinal image sensor 710 of the retinal camera 702, a retinal image of the eye.

[0088] As discussed elsewhere herein, in an embodiment, the adjustable curtain (such as adjustable curtain 210) comprises a plurality of panels. In an embodiment, moving, with the motor 746, the lens tube along one or more of the first axis and the second axis comprises folding or unfolding at least some of the plurality of panels.

[0089] The processes explained above are described in terms of computer software and hardware. The techniques described may constitute machine-executable instructions embodied within a tangible or non- transitory machine (e.g., computer) readable storage medium, that when executed by a machine will cause the machine to perform the operations described. Additionally, the processes may be embodied within hardware, such as an application specific integrated circuit ("ASIC") or otherwise.

[0090] A tangible machine-readable storage medium includes any mechanism that provides (i.e., stores) information in anon-transitory form accessible by a machine (e.g., a computer, network device, personal digital assistant, manufacturing tool, any device with a set of one or more processors, etc.). For example, a machine-readable storage medium includes recordable / non-recordable media (e.g., read only memory (ROM), random access memory (RAM), magnetic disk storage media, optical storage media, flash memory devices, etc.).163960-P402WO

[0091] The above description of illustrated embodiments of the invention, including what is described in the Abstract, is not intended to be exhaustive or to limit the invention to the precise forms disclosed. While specific embodiments of, and examples for, the invention are described herein for illustrative purposes, various modifications are possible within the scope of the invention, as those skilled in the relevant art will recognize.

[0092] These modifications can be made to the invention in light of the above detailed description. The terms used in the following claims should not be construed to limit the invention to the specific embodiments disclosed in the specification. Rather, the scope of the invention is to be determined entirely by the following claims, which are to be construed in accordance with established doctrines of claim interpretation.173960-P402WO

Claims

CLAIMSWhat is claimed is:

1. A retinal camera comprising: a lens tube that moves along a first axis and a second axis orthogonal to the first axis to align with an eye to capture an image of the eye through the lens tube; and a face rest adapted to steady a head when capturing the image; and an adjustable curtain disposed inside the retinal camera to conceal internal components of the retinal camera from being visible through the face rest, wherein the lens tube protrudes through the adjustable curtain, and wherein the adjustable curtain comprises: a first adjustable mechanism that permits the lens tube to move along the first axis; and a second adjustable mechanism that permits the lens tube to move along the second axis.

2. The retinal camera of Claim 1, wherein the adjustable curtain comprises a plurality of panels.

3. The retinal camera of Claim 2, wherein adjustable curtain comprises an accordion bellows comprising the plurality of panels, and wherein accordion bellows is shaped to compress or expand through bending between coupled adjacent panels of the plurality of panels.

4. The retinal camera of Claim 3, wherein the adjustable curtain further comprises a plurality of pins hingedly coupling adjacent panels of the plurality of panels.

5. The retinal camera of Claim 3, further comprising a fabric sleeve defining a plurality of slots shaped to receive panels of the plurality of panels.

6. The retinal camera of Claim 3, wherein the adjustable curtain comprises a molded or extruded polymeric piece comprising the plurality7of panels.183960-P402WO7. The retinal camera of Claim 2, wherein the adjustable curtain comprises telescoping shutters comprising the plurality of panels, wherein adjacent panels of the plurality of panels are cooperatively coupled.

8. The retinal camera of Claim 7, wherein each panel of the plurality of panel defines a primary panel face; a first tab extending from the primary panel face in a first direction, and a second tab extending from the primary panel face in a second direction opposite the first direction.

9. The retinal camera of Claim 2, wherein the adjustable curtain comprises a tambour comprising: a flexible sheet; and the plurality of panels coupled to the flexible sheet.

10. The retinal camera of Claim 9, wherein the plurality of panels is disposed on a first side of the flexible sheet, the adjustable curtain further comprising a plurality of fasteners disposed on a second side of the flexible sheet and coupled to the plurality of panels and coupling the plurality of panels to the flexible sheet.1 1. The retinal camera of Claim 1, wherein the adjustable curtain further comprises an aperture assembly defining an aperture shaped and positioned to slidably receive the lens tube.

12. The retinal camera of Claim 1 1 , wherein the aperture assembly comprises a seal shaped to provide a seal between the aperture assembly and the lens tube when the lens tube is slidably received by the aperture assembly.

13. The retinal camera of Claim 12, wherein the aperture assembly further comprises an aperture bracket defining a seal cavity shaped to encompass an edge portion of the seal and to allow movement of the seal within the seal cavity.

14. The retinal camera of Claim 11, wherein the aperture assembly is configured to allow movement of the lens tube along a third axis, wherein the third axis is orthogonal to the first axis and the second axis.

15. The retinal camera of Claim 11 , wherein the aperture assembly permits misalignment of a central axis of the aperture and a longitudinal axis of lens tube.193960-P402WO16. The retinal camera of Claim 1, further comprising a curtain bracket defining a slot shaped to receive a portion of the adjustable curtain, wherein the adjustable curtain is slidably received in the slot to allow translation of adjustable curtain along one of the first axis and the second axis.

17. The retinal camera of Claim 1, further comprising: a retinal image sensor optically coupled to the lens tube and positioned to acquire a retinal image of an eye through the lens tube; and a motor configured to move the lens tube to align with the eye.

18. The retinal camera of Claim 17. further comprising a controller operatively coupled to the retinal image sensor and the motor, the controller including logic that when executed by the controller causes the retinal camera to perform operations including: moving, with the motor, the lens tube along one or more of the first axis and the second axis, thereby aligning the retinal image sensor with the eye; and obtaining, with the retinal image sensor, a retinal image of the eye.

19. The retinal camera of Claim 1. wherein the internal components remain concealed as the lens tube moves along the first axis and the second axis.

20. A method of obtaining a retinal image of an eye with a retinal camera, the method comprising: moving, with a motor of the retinal camera, a lens tube of the retinal camera along one or more of a first axis and a second axis, thereby: actuating a first adjustable mechanism of an adjustable curtain of the retinal camera that permits the lens tube to move along the first axis; actuating second adjustable mechanism of the adjustable curtain that permits the lens tube to move along the second axis; and aligning a retinal image sensor with the eye; and obtaining, with a retinal image sensor of the retinal camera, a retinal image of the eye.

21. The method of Claim 20, wherein the adjustable curtain comprises a plurality of panels, and wherein moving, with the motor, the lens tube along one or203960-P402WOmore of the first axis and the second axis comprises folding or unfolding at least some of the plurality of panels.213960-P402WO

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