An ophthalmic device for testing peripheral refraction

Abstract

The present disclosure relates to an ophthalmic device (100) for testing peripheral refraction of an eye The device (100) comprises a body (2) having a first section (1) and a second section (4). The first section (1) is defined with a slot (8) and a reflective film (9) disposed on the slot (8). Further, the device (100) is having a projecting member (10) extending arcuately from a portion of the first section (1) and parallel to the first section (1). The projecting member (10) is defined with a plurality of apertures (12a, 12b, 12c), each of the plurality of apertures (12a, 12b, 12c) is parallel to the first section (1) and are configured to allow the light rays (15) to pass through the plurality of apertures (12a, 12b, 12c) onto the reflective film (9) for measuring the peripheral refraction of the eye.

Description

[0001] “AN OPHTHALMIC DEVICE FOR TESTING PERIPHERAL REFRACTION”

[0002] TECHNICAL FIELD

[0003] Present disclosure relates in general to a field of ophthalmology. Particularly, but not exclusively to an ophthalmic device for testing peripheral refraction of an eye of an individual.

[0004] BACKGROUND OF THE DISCLOSURE

[0005] Myopia also known as short-sightedness or near-sightedness is a refractive error an eye due to which the objects that are far away from the eye appear blurred. In myopia, light rays entering the eyes converge too soon and are brought to focus before reaching a retina and hence an image cannot be formed on the retina. Near-sightedness is one of the common eye problems and is estimated to affect 5 billion people which is nearly 5% of the world population by the year 2050. This near-sightedness can be corrected easily with the help of concave single vision lenses.

[0006] Generally, a handheld device called retinoscope in the art, is used by a clinician (typically an optometrist or an ophthalmologist) to objectively determine the refractive error of the eyes, thus acting as a starting point for prescribing the type of lens for vision correction. Clinician shines the light into the individual eye (through the pupil) whose refractive error needs to be determined and based on the movement of the light reflex from the retina, arrives on concluding the refractive error.

[0007] During this procedure, while individual whose refractive error is being determined is advised to look straight ahead and fixate onto a target, the clinician is required to align closely with the visual axis of that individual to attain accurate central refractive error or refractive error at the level of fovea.

[0008] However, refraction in the periphery of the eye i.e., peripheral refraction is considered to play a crucial role in myopia development and its progression. General retinoscopy technique cannot be used to accurately conduct peripheral refraction test. This is because the clinician cannot be sure of the angle of projection of the light rays on the eye of the individual. This may lead to inaccurate results while testing for the peripheral refraction. Also, there is no commercially available devices that is specifically designed for determining peripheral refraction. Currently, eye care professionals and researchers modify and use open-field auto-refractors that are originally designed for determining central refractive error. These devices are expensive, needs examination space and are cumbersome.

[0009] The present disclosure is directed to overcome one or more limitations stated above or other such limitations associated with the conventional arts.

[0010] SUMMARY OF THE DISCLOSURE

[0011] The one or more shortcomings of the prior art are overcome by an ophthalmic device. Additional advantages are provided through the provisions of the present disclosure. Other embodiments and aspects of the disclosure are described in detail herein.

[0012] In one non-limiting embodiment of the present disclosure discloses an ophthalmic device for testing peripheral refraction of an eye. The ophthalmic device comprises a body having a first section and a second section opposite the first section. Further, the first section is defined with a slot extending along a longitudinal axis. The ophthalmic device having a reflective film disposed on the slot which is configured to reflects light rays focused at an incident angle from a retinoscope. The device has a projecting member extending arcuate ly from a portion of the first section of the body. The projecting member is parallel to the first section at a distance from the first section. The projecting member is defined with a plurality of apertures. Each of the plurality of apertures is parallel to the first section and are configured to allow the light rays to pass through the plurality of apertures to fall onto the reflective film for measuring peripheral refraction of the eye.

[0013] In an embodiment of the present disclosure, the plurality of apertures comprises a central aperture and at least two apertures defined at either side of the central aperture.

[0014] In an embodiment of the present disclosure, the central aperture is aligned with respect to the slot and the at least two apertures are oriented at a predefined angle with respect to the slot.

[0015] In an embodiment of the present disclosure, the central aperture is configured to allow light rays from a retinoscope to pass along a field of vision of an individual onto the reflective film disposed on the slot. In an embodiment of the present disclosure, each of the at least two apertures are configured to allow light rays from the retinoscope at the predefined angle onto the reflective film disposed on the slot.

[0016] In an embodiment of the present disclosure, the predefined angle (0) of incidence of light rays from the at least two apertures is in a range of 20°-30° with respect to a visual axis defined along the field of vision of the individual.

[0017] In an embodiment of the present disclosure, the projecting member extends arcuate ly from an end of the first section.

[0018] In an embodiment of the present disclosure, the projecting member extends arcuately from side portions of the first section.

[0019] In an embodiment of the present disclosure, the second section is defined with a provision configured to accommodate at least one lens.

[0020] In an embodiment of the present disclosure, the reflective film is made of at least one of a retro- reflective tape or a coating.

[0021] It is to be understood that the aspects and embodiments of the disclosure described above may be used in any combination with each other. Several of the aspects and embodiments may be combined together to form a further embodiment of the disclosure.

[0022] The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.

[0023] BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS

[0024] The novel features and characteristic of the disclosure are set forth in the description. The disclosure itself, however, as well as a preferred mode of use, further objectives, and advantages thereof, will best be understood by reference to the following description of an illustrative embodiment when read in conjunction with the accompanying figures. One or more embodiments are now described, by way of example only, with reference to the accompanying figures wherein like reference numerals represent like elements and in which: Fig. 1 illustrates a perspective view of an ophthalmic device, in accordance with an embodiment of the present disclosure.

[0025] Fig. 2 illustrates a perspective view of the ophthalmic device connected to a trial frame in accordance with another embodiment of the present disclosure.

[0026] Fig. 3 illustrates a schematic diagram depicting the working of the ophthalmic device of Fig.

[0027] 1.

[0028] Fig. 4 illustrates a perspective view of the ophthalmic device in accordance with another embodiment of the present disclosure.

[0029] Fig. 5 illustrates a perspective view of the ophthalmic device in accordance with another embodiment of the present disclosure.

[0030] Fig. 6 illustrates a perspective view of the ophthalmic device in accordance with another embodiment of the present disclosure.

[0031] Fig. 7 illustrates a perspective view of the ophthalmic device in accordance with another embodiment of the present disclosure.

[0032] Fig. 8 illustrates a perspective view of the ophthalmic device in accordance with another embodiment of the present disclosure.

[0033] Fig. 9 illustrates a perspective view of the ophthalmic device in accordance with another embodiment of the present disclosure.

[0034] The figures depict embodiments of the disclosure for purposes of illustration only. One skilled in the art will readily recognize from the following description that alternative embodiments of the device and working of the device illustrated herein may be employed without departing from the principles of the disclosure described herein.

[0035] DETAILED DESCRIPTION OF THE DISCLOSURE

[0036] The foregoing has broadly outlined the features and technical advantages of the present disclosure in order that the description of the disclosure that follows may be better understood. Additional features and advantages of the disclosure will be described hereinafter. It should be appreciated by those skilled in the art that the conception and specific embodiment disclosed may be readily utilized as a basis for modifying or designing other assemblies for carrying out the same purposes of the present disclosure. The novel features which are believed to be characteristic of the disclosure, both as to its organization and method of operation, together with further objects and advantages will be better understood from the following description when considered in connection with the accompanying figures. It is to be expressly understood, however, that each of the figures is provided for the purpose of illustration and description only and is not intended as a definition of the limits of the present disclosure.

[0037] The terms “comprises”, “comprising”, or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a setup, device, or method that comprises a list of components or steps does not include only those components or steps but may include other components or steps not expressly listed or inherent to such setup or device or method. In other words, one or more elements in a system or apparatus proceeded by “comprises. . . a” does not, without more constraints, preclude the existence of other elements or additional elements in the system or apparatus.

[0038] Embodiments of the present disclosure discloses an ophthalmic device for conducting peripheral refraction test. Conventionally, open-field auto-refractors are modified and used for conducting peripheral refraction which are expensive and are bulky. Further, the focus of light rays in the required angle from the field of vision is not obtained accurately by conventional techniques. In view of this, present disclosure provides an ophthalmic device which can be used with a retinoscope for guiding a clinician for conducting the peripheral refraction test.

[0039] Referring to Fig. 1, which illustrates a perspective view of an ophthalmic device (100) [hereinafter interchangeably referred as device (100)] for determining peripheral refraction of an individual. Peripheral refraction is considered to play a crucial role in myopia development and its progression therefore it’s important to know the peripheral refraction of the eye to stop development and progression of myopia in the eye. The device (100) includes a body (2) having a first section (1) and a second section (4), which are opposite to each other. In an embodiment, the first section (1) and second section (4) of the body (2) are defined with a uniform thickness. The first section (1) is defined with a slot (8) extending along a longitudinal axis (A-A) of the body (2). Further, the device includes a reflective film (9) disposed on the slot (8). The reflective film (9) is configured to reflect light rays (15) back to a source of light from retinoscope (13) [as seen in Fig. 3] at an incident angle and illuminates upon receiving the light rays (15). In an embodiment, the slot (8) is defined on the longitudinal axis (A-A) at a middle portion of the first section (1). As an example, reflective film (9) mab be made out of at least one of a retro-reflective tape or a coating.

[0040] Referring further to Fig. 1, the device (100) includes a projecting member (10) extending arcuate ly from an end (11) of the first section (1). The projecting member (10) is defined parallel to the first section (1) at a distance from the first section (1). That is, the projecting member extends arcuately from the end (11) of the first section (1) and raises away from the end (11) of the first section (1) and extends parallel to the first section (1) creating a gap between the projecting member (10) and the first section (1). In an illustrated embodiment, where the projecting member (10) extending arcuately cannot be construed as a limitation, since the projecting member (10) may extend vertically from the end (11) of the first section (1) and then extend parallel to the first section (1), defining the gap between the projecting member (10) and the first section (1). The projecting member (10) is defined with a plurality of apertures (12a, 12b, 12c) such that each ofthe plurality of apertures (12a, 12b, 12c) is parallel to the first section (1) and are configured to allow the light rays (15) towards the reflective film (9) for measuring the peripheral refraction of the eye. In an embodiment, the plurality of apertures (12a, 12b, 12c) includes a central aperture (12b) and at least two apertures (12a, 12c) defined at either sides of the central aperture (12b). The central aperture (12b) is aligned with respect to the slot (8) and the at least two apertures (12a, 12c) are oriented at a predefined angle (0) with respect to the slot (8).

[0041] Referring further to Fig. 1 in tandem with Fig. 3, the central aperture (12b) is configured to allow the light rays (15) from the retinoscope (13) to pass along a field of vision of the eye of the individual (16) onto the reflective film (9) disposed on the slot (8). In other words, the light rays (15) focused on a visual axis (3) with respect to the field of vision of the individual (16) is allowed through the central aperture (12b). Further, each of the at least two apertures (12a, 12c) are configured to allow the light rays (15) from the retinoscope (13) to pass through the at least two apertures (12a, 12b) at the predefined angle (0) onto the reflective film (9) disposed on the slot (8). In an embodiment, the predefined angle (0) of incidence of light rays (15) allowed from the at least two apertures (12a, 12c) is in a range of 20°-30° with respect to a visual axis (3). The visual axis (3) is defined along the field of vision of an individual fortesting peripheral refraction ofthe eye.

[0042] Referring again to Fig. 1, the second section (4) is defined with a provision (6) configured to accommodate the at least one lens for measuring a refractive index of the individual (16). The second section (4) may be positioned within a trial frame (200) [as seen in Fig. 2] . while testing peripheral refraction of the eye. In an embodiment, the provision (6) may be configured in a circular shape and such a construction cannot be construed as a limitation and the provision (6) may be defined in any suitable shape such as square, rectangle etc. The second section (4) is further includes a projection (17) extending from the provision (6) and the projection (17) is configured to engage with a surface of at least one slit (23) defined on a frame (22) for fixing the device (100) on to the trial frame (200).

[0043] In an embodiment, the device (100) during use is fixed to atrial frame (200) which is worn by an individual (16) and the device (100) is used to guide a clinician (18) in testing a peripheral refraction of an eye (as shown in Fig. 3). The trial frame (200) comprises a handle (24) and a frame (22) connected to the handle (24). The frame (22) is defined with at least one slit (23) to receive the device (100) along with at least one lens for examination of the eye (as shown in Fig. 2).

[0044] With reference to Fig. 3, in an operational embodiment to determine the peripheral refraction of the eye of the individual (16). The device (100) is fixed to the trial frame (200) [as seen in Fig. 2] along with the at least one lens. The trial frame (200) is then positioned in front of the individual (16) and the individual (16) is made to look through the provision (6) in the visual axis (3). The field of vision of the eye of the individual (16) is then fixed in the visual axis (3). The clinician (18) focuses the light rays (15) on the eye of the individual (16) in the visual axis (3) initially using the retinoscope (13). The predefined distance (d) from the clinician (18) to the individual (16) may also determine by focusing the light rays (15) on the central aperture (12b). The central aperture (12b) allows the light rays (15) and redirects the same onto the reflective film (9) only when the clinician (18) reaches the predefined distance (d). Upon reaching the distance (d), the reflective film (9) illuminates and provides indication to the clinician (18) regarding the predefined distance (d) for testing the peripheral refraction of the eye.

[0045] Once the light rays (15) are fixed on the visual axis (3), the clinician (18) moves away from one side of the visual axis (3) and concentrates the light rays (15) initially on the any one aperture (12a) of the at least two apertures (12a, 12c) defined on the projecting member (10) at an angle (6). The corresponding slot of the at least two apertures (12a, 12b) receive the light rays (15) and allows the light rays (15) only when the light rays (15) of the retinoscope (13) are at the predefined angle (6). Upon receipt of the light rays (15) at the predefined angle (6), the reflective film (9) reflects the light rays (15) back to the retinoscope (13) and gets illuminated. Consequently, the light rays (15) from the retinoscope (13) are diverted onto the eye of the individual (16) to conduct peripheral refraction test. Similarly, the clinician (18) moves to another side with respect to the visual axis (3) for conducting peripheral refraction test by focusing the light rays (15) onto the remaining aperture (12c) of the at least two apertures (12a, 12c). Along with the determination of the predefined angle (0) by the reflective film (9) to guide the clinician (18) to focus the light rays (15) onto a retina of the eye at the predefined angle (0) whose refractive error needs to be determined and based on the movement of the light reflex from the retina, the clinician (18) arrives on concluding the refractive error, which is indication of peripheral refraction. Further, by determining the peripheral refraction the clinician (18) determines the progression and development of myopia in the eye and could give the suitable lens for the individual (16).

[0046] Now referring to Fig. 4, which illustrates a perspective view of another embodiment of the device (100). In an embodiment, the constructional aspects of the first section (1) is similar to that of the device ( 100) of the first embodiment. In another embodiment the proj ecting member (10) extends arcuately from side portions of the first section (1) and rest of the constructional aspects of the projecting member (10) is similar to that of the device (100) of the first embodiment. Additionally, at least one groove (5) is defined on the body (2) extending along a portion of the second section (4). In an embodiment, the at least one groove (5) extends arcuately to cover a crescent (or) half portion of the provision (6). The projecting member (10) contacts the at least one groove (5) at one end. The at least one groove (5) is configured to engage with a surface of at least one slit (23) defined on the frame (22) for fixing the at least one lens on to the trial frame (200).

[0047] Now referring to Fig. 5, which illustrates a perspective view of another embodiment of the device (100). In an embodiment, the constructional aspects of the projecting member (10) and the first section (1) are similar to that of the device (100) of the above embodiment. Additionally, the second section (4) is defined with a plurality of curved surfaces (26) complementary to the shape of the at least one lens to securely fit the at least one lens within the device (100). The plurality of curved surfaces (26) may also extend to a portion of the at least one groove (5) defined around the provision (6) of the second section (4).

[0048] Referring to Fig. 6, which illustrates a perspective view of another embodiment of the device (100). In an embodiment, the constructional aspects of the projecting member (10) and the first section (1) are similar to that of the device (100) of the above embodiment. Additionally, the device (100) comprises a flat surface around the provision (6) of the second section (4) to fit into the at least one slit (23) defined on the frame (22). Further, an auxiliary slot (30) is defined below the slot (8) to act as a reference for accurate (or) straight alignment of the device (100) with the trial frame (200). In an embodiment, a simple reference such as a marker or a line may be provided for proper alignment of the device (100) with respect to the trial frame (200).

[0049] Referring to Fig. 7, which illustrates a perspective view of another embodiment of the device (100). In an embodiment, the constructional aspects of the projecting member (10) and the first section (1) are similar to that of the device (100) of the above embodiment. Additionally, the device (100) comprises a flat surface (25) around the provision (6) of the body (2) to fit into the at least one slit (23) that are defined on the frame (22). The plurality of curved surfaces (26) are also defined around a portion of the flat surface (25). The plurality of curved surfaces (26) are designed complementary to the shape of the at least one lens to securely fit the at least one lens within the device (100).

[0050] Referring to Fig. 8, which illustrates a perspective view of another embodiment of the device (100). The provision (6) and the body (2) are joined to each other by a connecting member (28). Projecting member (10) extends from each end portion i.e. from first section (1) and second section (4) of the body (2) oriented opposite to each other. The provision (6) is formed separately from the base to impart stability to the device (100). Each projecting member (10) varies in width from another projecting member (10). Each projecting member (10) is defined with a plurality of apertures (12a, 12b, 12c) for receiving the light rays (15) as explained in the aforementioned embodiments of the device (100).

[0051] Now referring to Fig. 9, which illustrates a perspective view of another embodiment of the device (100). The constructional aspects of the projecting member (10) and the body (2) are similar to that of the device ( 100) of the above embodiment. Additionally, a portion around the provision (6) is defined with the plurality of curved surfaces (26) that are complementary to the at least one lens. This arrangement allows to securely fit the at least one lens along with the device (100) within the trial frame (200). Further, the body (2) is defined with two slots at both the end portions of the first and second sections (1, 4). Additionally, the slot (8) having the reflective film (9) is defined on the body (2) parallel to each projecting member (10) and are positioned below the plurality of apertures (12a, 12b, 12c) for receiving the light rays (15) as explained in the aforementioned embodiments. Both the reflective film (9) are configured to illuminate the light rays (15), when focused from the central aperture (12b) by the retinoscope (13).

[0052] In an embodiment, the predefined angle (0) may be preferred to be 20°-30° with respect to the visual axis (3) for testing peripheral refraction. However, this cannot be considered as a limitation, and the predefined angle (0) may be varied based on the requirement.

[0053] In an embodiment, the distance (d) between the individual (16) and the clinician (18) may be preferred to be 50-80 cm for testing peripheral refraction. However, this cannot be considered as a limitation, and the distance (d) may be varied based on the requirement.

[0054] In an embodiment, the device (100) may be manufactured by at least one of a 3-d printing and casting or any suitable machining process.

[0055] The device (100) of the present disclosure is simple in construction and can be used with the retinoscope (13) fortesting peripheral refraction.

[0056] The device (100) of the present disclosure comprises a single structure without any additional components or attachments. Advantageously, this reduces overall cost and maintenance of the device (100).

[0057] It is to be understood that the aspects and embodiments of the disclosure described above may be used in any combination with each other. Several of the aspects and embodiments may be combined together to form a further embodiment of the disclosure.

[0058] Equivalents:

[0059] With respect to the use of substantially any plural and / or singular terms herein, those having skill in the art can translate from the plural to the singular and / or from the singular to the plural as is appropriate to the context and / or application. The various singular / plural permutations may be expressly set forth herein for sake of clarity.

[0060] It will be understood by those within the art that, in general, terms used herein, and especially in the appended claims (e.g., bodies of the appended claims) are generally intended as “open” terms (e.g., the term “including” should be interpreted as “including but not limited to,” the term “having” should be interpreted as “having at least,” the term “includes” should be interpreted as “includes but is not limited to,” etc.). It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases “at least one” and “one or more” to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles “a” or “an” limits any particular claim containing such introduced claim recitation to inventions containing only one such recitation, even when the same claim includes the introductory phrases “one or more” or “at least one” and indefinite articles such as “a” or “an” (e.g., “a” and / or “an” should typically be interpreted to mean “at least one” or “one or more”); the same holds true for the use of definite articles used to introduce claim recitations.

[0061] In addition, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should typically be interpreted to mean at least the recited number (e.g., the bare recitation of “two recitations,” without other modifiers, typically means at least two recitations, or two or more recitations). Furthermore, in those instances where a convention analogous to “at least one of A, B, and C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B, and C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and / or A, B, and C together, etc.). In those instances where a convention analogous to “at least one of A, B, or C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B, or C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and / or A, B, and C together, etc.). It will be further understood by those within the art that virtually any disjunctive word and / or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase “A or B” will be understood to include the possibilities of “A” or “B” or “A and B.”

[0062] While various aspects and embodiments have been disclosed herein, other aspects and embodiments will be apparent to those skilled in the art. The various aspects and embodiments disclosed herein are for purposes of illustration and are not intended to be limiting, with the true scope and spirit being indicated by the following claims.

[0063] Referral Numerals:

[0064]

Claims

Claims:

1. An ophthalmic device (100) for testing peripheral refraction of an eye of an individual, the ophthalmic device (100) comprising: a body (2) having a first section (1) and a second section (4), opposite to the first section (1), the first section (1) is defined with a slot (8) extending along a longitudinal axis (A -A); a reflective film (9) disposed on the slot (8), wherein the reflective film (9) reflects light rays (15) focused at an incident angle from a retinoscope (13); and a projecting member (10) extending arcuately from a portion of the first section (1) of the body (2) and parallel to the first section (1) at a distance from the first section (1), the projecting member (10) is defined with a plurality of apertures (12a, 12b, 12c), each of the plurality of apertures (12a, 12b, 12c) is parallel to the first section (1) and are configured to allow the light rays (15) to pass onto the reflective film (9) for measuring peripheral refraction of the eye.

2. The ophthalmic device (100) as claimed in claim 1, wherein the plurality of apertures (12a, 12b, 12c) comprises a central aperture (12b) and at least two apertures (12a, 12c) defined at either sides of the central aperture (12b).

3. The ophthalmic device (100) as claimed in claim 2, wherein the central aperture (12b) is aligned with respect to the slot (8) and the at least two apertures (12a, 12c) are oriented at a predefined angle (0) with respect to the slot (8).

4. The ophthalmic device (100) as claimed in claim 3, wherein the central aperture (12b) is configured to allow light rays (15) from the retinoscope (13) to pass along a field of vision of the eye of the individual (16) onto the reflective film (9).

5. The ophthalmic device (100) as claimed in claim 3, wherein each of the at least two apertures (12a, 12c) are configured to allow light rays (15) from the retinoscope (13) at the predefined angle (0) onto the reflective film (9) disposed on the slot (8).

6. The device (100) as claimed in claim 5, wherein the predefined angle (0) of incidence of light rays (15) from the at least two apertures (12a, 12b) is in a range of 20°-30° with respect to a visual axis (3) defined along the field of vision of the individual (16).

7. The ophthalmic device ( 100) as claimed in claim 1 , wherein the proj ecting member (10) extends arcuately from an end (11) of the first section (1).

8. The ophthalmic device ( 100) as claimed in claim 1 , wherein the proj ecting member (10) extends arcuately from side portions of the first section (1).

9. The ophthalmic device (100) as claimed in claim 1, wherein the second section (4) is defined with a provision (6) configured to accommodate at least one lens.

10. The device (100) as claimed in claim 1, wherein the reflective film (9) is made of at least one of a retro-reflective tape or a coating.

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