Spectacle lens semifinished product with cavity and waveguide

Abstract

A spectacle lens semifinished product (100) has a body (101) with a cavity (120) and a waveguide (130) located in the cavity (120). The body (101) has a front face (110) and a rear face (140). The rear face (140) has a modifiable refractive power.

Description

Semi-finished ophthalmic lens with cavity and waveguide TECHNICAL FIELD

[0001] The disclosure relates generally to ophthalmic lens semi-finished products and more specifically to ophthalmic lens semi-finished products for data glasses, such as glasses for augmented reality (AR) or virtual reality (VR). BACKGROUND

[0002] Both AR smart glasses and VR smart glasses (hereinafter generally referred to as smart glasses) use waveguides to display a virtual image in a user's field of view. Since the waveguides are flat, they have no refractive power. The waveguides themselves therefore cannot correct any visual impairment of a smart glasses user. To correct visual impairment in smart glasses, attachments can be used on the waveguides, for example, but these make the smart glasses heavier and bulkier. Another approach to correcting visual impairment in smart glasses is to provide individual front and back surfaces for the waveguide using 3D printing. However, this approach is not suitable for mass market production. Furthermore, with this approach, the waveguide stands out visually from the 3D-printed front and back surfaces and is thus visually perceptible when using the smart glasses. SUMMARY OF THE INVENTION

[0003] Accordingly, it is an object of the present disclosure to provide spectacle lenses and spectacle lens semi-finished products for data glasses which can be adapted in existing manufacturing processes for spectacle lenses for prescription glasses to a visual impairment both with regard to the image displayed by a waveguide and, in the case of AR data glasses, with regard to the environment.

[0004] To achieve this object, the present disclosure provides a spectacle lens semi-finished product according to claim 1. The spectacle lens semi-finished product comprises a body having a front surface, a rear surface opposite the front surface, and two side surfaces. The two side surfaces laterally connect the front surface and the rear surface to one another. The spectacle lens semi-finished product also comprises a waveguide configured to guide a virtual image into the body and to couple the virtual image out in the body. The body has a cavity extending from an opening in one of the two side surfaces into the body. The waveguide is arranged in the cavity at a distance from a surface of the cavity.The front surface has a front refractive power configured to define an imaging distance at which a virtual image coupled out of the waveguide is perceived. The rear surface has a rear modifiable refractive power. The sum of the front refractive power and the rear modifiable refractive power corresponds to a refractive error correction value. The rear modifiable refractive power is configured to set the refractive error correction value.

[0005] The front surface is a surface that, in its intended state (when the semi-finished lens is integrated into a pair of glasses and the glasses are worn by the wearer), faces away from the eye. The rear surface, in its intended state, is therefore directed toward the eye.

[0006] The modifiable refractive power can therefore be individually adjusted to the vision of a specific user. When the posterior refractive power is modified, the refractive error correction value changes so that it subsequently corresponds to the user's target refractive error correction value (e.g., according to a prescription).

[0007] This adjustment of the refractive error correction value can be achieved in various ways, e.g., by appropriately processing the posterior surface. For example, material could be removed from the posterior surface, such as in a grinding process. Alternatively or additionally, it would be possible to modify the posterior refractive power by applying or bonding material, for example, by gluing a prescription shell. The semi-finished spectacle lens can therefore also be referred to as a blank.

[0008] To achieve this object, the present disclosure further provides a pair of smart glasses. The smart glasses include a display system configured to display a to generate a virtual image and couple it into a waveguide, and two spectacle lenses. Each spectacle lens is manufactured from the above-defined spectacle lens semi-finished product by adjusting the refractive error correction value via the posterior modifiable refractive power. However, it would also be possible for only one of the two spectacle lenses to be manufactured from the above-defined spectacle lens semi-finished product by adjusting the refractive error correction value via the posterior modifiable refractive power.

[0009] To achieve this object, the present disclosure also provides a method. The method comprises modifying a posterior refractive power of a posterior surface of a body of a spectacle lens semi-finished product. The spectacle lens semi-finished product comprises a body having a front surface, the posterior surface opposite the front surface, and two side surfaces. The two side surfaces laterally connect the front surface and the posterior surface to one another. The spectacle lens semi-finished product also comprises a waveguide configured to guide a virtual image into the body and to couple the virtual image out in the body. The body has a cavity extending from an opening in one of the two side surfaces into the body. The waveguide is arranged in the cavity at a distance from a surface of the cavity.The front surface has front refractive power configured to define an imaging distance at which a virtual image coupled out of the waveguide is perceived.

[0010] Modifying the posterior refractive power may involve applying material to the posterior surface. Alternatively or additionally, modifying the posterior refractive power may involve removing material from the posterior surface. For example, material could be removed from the posterior surface, such as in a grinding process. Alternatively or additionally, it would be possible to modify the posterior refractive power by applying or bonding material, for example, by bonding a corrective shell.

[0011] The posterior refractive power can be modified individually for each user. For example, control data can be obtained that is indicative of the user's target refractive error correction value. Then, it would be possible to modify the value in such a way that the sum of the anterior refractive power and the posterior refractive power (after modification) corresponds to the target refractive error correction value.

[0012] Such aspects described above can also be combined with each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Examples of the present disclosure are described with reference to the following drawings, in which like reference numerals refer to like elements.

[0014] FIGS. 1A and 1B show a semi-finished ophthalmic lens according to an example of the present disclosure.

[0015] FIG. 2 shows the ophthalmic lens semi-finished product according to another example of the present disclosure.

[0016] FIG. 3 illustrates a beam splitting coating of the ophthalmic lens semi-finished product of FIGS. 1 and 2 according to an example of the present disclosure.

[0017] FIG. 4 illustrates exemplary light ray paths in the ophthalmic lens semi-finished product of FIG. 1 according to an example of the present disclosure.

[0018] FIG. 5 is a flowchart of an exemplary method for manufacturing a semi-finished ophthalmic lens according to an example of the present disclosure.

[0019] It should be understood that the above-mentioned drawings are not intended to limit the present disclosure in any way. Rather, these drawings are provided to facilitate a better understanding of the present disclosure. Those skilled in the art will readily understand that aspects of the present disclosure shown in one drawing may be combined with aspects in another drawing or omitted without departing from the scope of the present disclosure. DETAILED DESCRIPTION

[0020] The present disclosure provides a spectacle lens semi-finished product which, from the point of view of a regular manufacturing process of spectacle lenses for prescription spectacles, represents a blank which functions like a blank for a regular spectacle lens of a semi-finished product. The lens can be adapted to a visual impairment by machining the refractive power of a surface. For this purpose, the semi-finished ophthalmic lens takes the form of a lens blank with a front surface and a rear surface, each with a refractive power. From one side, between the two surfaces, a waveguide extends into a cavity in the semi-finished ophthalmic lens, in which the waveguide is arranged at a distance from the body of the semi-finished ophthalmic lens. The distance forms a gap, which can be filled, for example, with air or an adhesive, making the waveguide visually imperceptible.

[0021] The front surface and the rear surface each have a refractive power. The refractive power of the front surface defines the distance at which a virtual image is perceived. The sum of the two refractive powers provides a refractive error correction value. The refractive error correction value can be adjusted by modifying the refractive error power of the rear surface. In other words, the refractive power of the front surface determines the distance at which a virtual image coupled out of the waveguide is perceived, while the refractive error power of the rear surface serves to adjust the sum of the two refractive errors with respect to a desired refractive error correction value (the target refractive error correction value).

[0022] In summary, the semi-finished lens enables the production of lenses for smart glasses that can be adjusted to a specific visual impairment using standard processes for corrective eyewear. At the same time, the waveguide arranged in the semi-finished lens or the fully adjusted lens is invisible. Thus, the semi-finished lens can be used to provide smart glasses that are adjusted to the user's visual impairment, enable improved use due to the invisible waveguide, and are also cost-effective to manufacture.

[0023] The general concept of the ophthalmic lens semi-finished product is described in more detail below with reference to the figures, wherein Figs. 1A and 1B and Fig. 2 show examples of the ophthalmic lens semi-finished product according to the present disclosure. Fig. 3 illustrates a beam splitting coating of the ophthalmic lens semi-finished product. Fig. 4 illustrates the path of light rays that are coupled out of the waveguide of the ophthalmic lens semi-finished product, as well as the path of light rays that originate from the environment and pass through the ophthalmic lens semi-finished product.

[0024] FIG. 1A shows a plan view of a spectacle lens semi-finished product 100. FIG. 1B shows a cross-section of the spectacle lens semi-finished product 100 along section line AA in FIG. 1A.

[0025] In the context of the present disclosure, a semi-finished spectacle lens is understood to mean a spectacle lens that can be adjusted to a target visual impairment value within the framework of existing processes for adjusting spectacle lenses for prescription glasses before being inserted into data glasses. Since the semi-finished spectacle lens can already have a preset visual impairment value that is generally different from the target visual impairment value, but can sometimes also correspond exactly to the target visual impairment value, adjustment may no longer be necessary depending on the desired visual impairment value. In the context of the present disclosure, a semi-finished spectacle lens therefore refers to a spectacle lens that may still need to be adjusted to a desired visual impairment value, if necessary.but also already has the desired refractive error correction value, which means that processing of the semi-finished lens is no longer necessary.

[0026] Semi-finished ophthalmic lens 100 comprises a body 101. Body 101 has a front surface 110 and a rear surface 140 opposite the front surface 110. Furthermore, body 101 has two side surfaces (in FIG. 1, these bound the body 101 on the left and right) that laterally connect the front surface and the rear surface. Body 101 further comprises a cavity 120 that extends into body 101 from an opening in one of the two side surfaces. As shown in FIG. 1A, body 101 can be circular. However, this is merely an example, since body 101 can take any shape that allows semi-finished ophthalmic lens 100 to be adapted to a visual impairment using standard processes for corrective eyewear. Body 101 can comprise plastic and can accordingly be manufactured, for example, by injection molding.

[0027] Semi-finished ophthalmic lens 100 further comprises a waveguide 130. Waveguide 130 is arranged in cavity 120 at a distance 122 from a surface of cavity 120. Waveguide 130 is configured to guide a virtual image into the body and to couple the virtual image out of the body at a coupling-out location. For this purpose, waveguide 130 can be coupled, for example, to an electronic device arranged outside of semi-finished ophthalmic lens 100 with a display, the image of which is coupled into waveguide 130 as a virtual image and within the body 101. For this purpose, waveguide 130 can extend to the opening from one of the two side surfaces, as indicated in Figs. 1A, 1B, and 2. Waveguide 130 can also be coupled at the opening of the body 101 to an adjacent waveguide, which in turn is coupled to the display of the electronic device. Waveguide 130 can, for example, comprise mineral glass or any other material that allows the virtual image to be transmitted due to total internal reflection.

[0028] Waveguide 130 may have a coating 132 that enables the virtual image to be coupled out of waveguide 132 at an outcoupling location. Coating 132 may accordingly also be referred to as outcoupler 132. Outcoupler 132 may be configured to substantially terminate the transmission of the virtual image by means of total internal reflection and to couple the virtual image out of waveguide 130 toward the rear surface 140.

[0029] To substantially prevent visibility of the waveguide 130 when viewing the body 101, the waveguide 130 and the body 101 may have the same refractive index.

[0030] In some examples of the present disclosure, the gap 122 between the waveguide 130 and the surface of the cavity 120 may be filled with air. To ensure stable reception of the waveguide 130 in the cavity 120 in such examples of the ophthalmic lens semi-finished product, a plurality of holders 121 may be arranged on the surface of the cavity 120. This concept is shown in Fig. 1B. As further shown in Fig. 1B, the holders 121 may take on different shapes, each suitable for stably holding the waveguide 130 in the body 101. The holders 121 may have the same refractive index as the body 101 in order to reduce or eliminate visibility of the waveguide 130 and the stabilization of the waveguide 130 in the cavity 120. For example, both the cavity 120 and the supports 121 may be defined by a mold used to manufacture body 101 by injection molding.Thus, the supports 121 can be made of the same material as body 101 and thus have the same refractive index. Since in such a case the supports 121 represent projections of the body 101 from the perspective of the body 101, the supports 121 can also be considered a component of the body 101.

[0031] In some examples of the present disclosure, an adhesive layer may be arranged at distance 122, which is configured to connect waveguide 130 and body 101 and thus stabilize waveguide 130 in cavity 120. This is illustrated in Fig. 2, in which the adhesive layer is illustrated by hatching of distance 122. To reduce or prevent the visibility of waveguide 130 in body 101, the refractive indices of at least one of waveguide 130, the adhesive layer, or body 101 may be matched to the refractive index of at least one other of these three elements. Accordingly, at least one of these three elements may have a different refractive index. For example, waveguide 130 and body 101 may have matched refractive indices, and the adhesive layer may thus have a different refractive index.In such an example, the adhesive layer may have a lower refractive index than waveguide 130. For example, the adhesive layer and waveguide 130 may have matched refractive indices, while body 101 may have a different refractive index. For example, the refractive indices of all three elements may also be matched.

[0032] To further reduce or prevent the visibility of waveguide 130, a beam splitting coating 131 may be applied to waveguide 130, particularly in the example where the refractive indices of all three elements are matched. Beam splitting coating 131 may be configured to split light beams depending on an angle of incidence. For this purpose, beam splitting coating 131 may be implemented as a layer stack of a plurality of successive first and second layers, as shown in Fig. 3. In the example of Fig. 4, beam splitting coating 131 comprises successive layers 131i and 1312. The layers may, for example, comprise silicon oxide and titanium oxide. For example, beam splitting coating 131 may consist of alternating layers of silicon oxide and titanium oxide. However, these materials are only intended as examples.Beam splitting coating 131 may be made of any material or sequence of materials that enables light to be split depending on the respective angle of incidence.

[0033] Anterior surface 110 has an anterior refractive power. The anterior refractive power is defined by the curvature of anterior surface 110. Posterior surface 140 has a posterior modifiable refractive power. Posterior modifiable refractive power 140 is defined by the curvature of posterior surface 140.

[0034] As illustrated by the exemplary light rays in Fig. 4, the front refractive power is configured to define an imaging distance at which the virtual image coupled out of waveguide 130 is perceived. As further illustrated by the exemplary light rays in Fig. 4, the rear modifiable refractive power is configured to set a refractive error correction value that corresponds to a sum of the front refractive power and the rear modifiable refractive power.

[0035] The sum of the front refractive power and the rear modifiable refractive power gives the refractive error correction value of the semi-finished lens, as shown in equation (1): Dtot front + tailcoat U ) In equation (1 ), Dtot denotes the refractive error correction value or the total refractive power of spectacle lens semi-finished product 100, Df ront is the anterior refractive power, and Dback is the posterior modifiable refractive power. The anterior refractive power is determined by the imaging distance at which the virtual image of the data glasses is to be perceived. For example, if the virtual image is to be perceived at a distance of 10 m, the anterior refractive power is 0.1 dpt. The refractive error correction value is derived from the refractive error of a user of the semi-finished lens or the data glasses. Thus, the only modifiable variable in equation (1) is the posterior modifiable refractive power. Accordingly, equation (1) can also be rearranged according to the posterior modifiable refractive power, as shown in equation (2):

[0036] If a user has normal vision, the refractive error correction value of the semi-finished lens must be 1000 D, since there is no refractive error. According to equation (2), at an imaging distance of 10 m, the rear modifiable refractive power must therefore be -0.1 D. In other words, the rear modifiable refractive power must balance the front refractive power so that light originating from the surroundings of the data glasses is not distorted for the user. Since the virtual image coupled out of waveguide 130 only passes through rear surface 140, the virtual image experiences only the rear modifiable refractive power. However, since the rear modifiable refractive power compensates for the front refractive power for ambient light, the virtual image is displayed at the imaging distance defined by front surface 110.

[0037] This concept is illustrated in Fig. 4 by two example light rays that are propagated into waveguide 130 and then coupled out. The two example light rays only experience the rear modifiable power. However, from a user's perspective, the light rays appear to originate from the environment, as shown by the dashed extension and deflection of these light rays. From a user's perspective, the light rays therefore also experience the front refractive power. In comparison, Fig. 4 shows light rays from the environment that experience both the rear refractive power and the front refractive power. Light rays from the environment that pass from the front surface 110 through waveguide 130 are not deflected any differently than light rays from the environment that do not pass through waveguide 130, as shown in Fig. 4. In other words, waveguide 130 is transparent to ambient light.

[0038] To illustrate the concept of how the front refractive power affects the virtual image coupled out of waveguide 130, a user with ametropia was used. However, as can be seen from equation (2), any ametropia correction value can be adjusted using the posterior modifiable refractive power, as shown in Table 1 below for five example imaging distances and in increments of 2 dpt for ametropia correction values ​​from -6 dpt to 6 dpt: Table 1 : Example values ​​of the posterior modifiable refractive power based on specified refractive error correction values ​​and imaging distances

[0039] For example, an optician or a manufacturer of data glasses can keep a series of semi-finished products with anterior refractive power values ​​as shown in Table 1 as blanks and adjust the posterior modifiable refractive power to a target refractive error correction value by machining, for example by grinding or other methods for machining the curvature of the posterior surface.

[0040] In summary, the anterior refractive power defines an imaging distance and together the anterior refractive power and the posterior modifiable refractive power define a refractive error correction value that can be adjusted via the posterior modifiable refractive power.

[0041] Both the first surface 110 and the second surface 120 can each have a first coating 111 and a second coating 141. The first coating 111 and the second coating 141 can be, for example, a hard coating, an anti-reflective coating, a color cast coating, an ultraviolet (UV) protective coating, or a polarization coating. Both the first surface 110 and the second surface 120 can have more than one coating, which can also be one of the coatings mentioned above. It should be understood that further and different coatings of the first surface 110 and / or the second surface are possible, depending on the requirements that the spectacle lens semi-finished product 10 or the data glasses must meet.

[0042] The semi-finished spectacle lens with a substantially invisible waveguide 130, which can be adjusted to a visual impairment value using the rear modifiable refractive power, can be used to produce spectacle lenses adapted to a user's visual impairment value for smart glasses. Such smart glasses accordingly comprise a display system. The display system is configured to generate a virtual image, for example, for AR or VR, and couple it into waveguide 130. Furthermore, the smart glasses comprise at least one spectacle lens manufactured from the semi-finished spectacle lens 100 by adjusting the visual impairment correction value via the rear modifiable refractive power.

[0043] FIG. 5 is a flow diagram of an exemplary method for manufacturing a semi-finished ophthalmic lens (also referred to as a semi-finished ophthalmic lens), such as the semi-finished ophthalmic lens 100 described above.

[0044] In box 905, the body and the waveguide are created. A blank is created. In box 905, for example, the body 101 is created as described above. The body can be manufactured, for example, by means of an injection molding process. For example, in box 905, the waveguide 130 can be created as described above. The waveguide is arranged in a cavity formed in the body. The waveguide can be glued to the body. In box 905, a coating - e.g., a hard coating and / or an anti-reflection coating) can be applied to the front surface and / or the back surface, e.g., after or before the waveguide is arranged in the cavity.

[0045] Using this technique, a semi-finished blank, i.e. a ophthalmic lens semi-finished product, can be produced by injection molding from polycarbonate or another standard injection-molded lens material, or by casting from CR39 or another standard cast lens material. During the casting or molding process, an insert creates a rectangular pocket in the finished lens that accommodates the planar waveguide. This pocket is designed to contain guide elements (holders) that hold the planar waveguide in the pocket. This body can then be treated in the value chain like a normal ophthalmic lens puck (i.e., as a semi-finished blank). This means that the body is machined on the back using the usual surface finishing and polishing machines used in the ophthalmic industry to achieve the To correct the user's visual acuity (back and front curvature in conjunction with the user's prescription) and to shift the virtual image from infinity into the user's range of accommodation. For example, an optician or a manufacturer of smart glasses can keep semi-finished products from Box 905 with values ​​as shown in Table 1 as blanks and, by machining them, for example, by grinding or other methods for machining the curvature of the posterior surface, adjust the posterior modifiable refractive power to a target refractive error correction value. This is explained in Box 910.

[0046] In box 910, the rear surface (which, in a normal state, i.e., when a pair of spectacles comprising the semi-finished lens is worn by a user, faces the user's eye) is modified. This changes the refractive error value. For example, material can be removed or material can be added. For example, a target refractive error value for a user (e.g., a prescribed refractive error value) can be obtained in box 910. The modification can be based on the target refractive error value. The modification can take into account a difference between the refractive error value of the semi-finished lens from box 905 and the target refractive error value.After modification, the sum of the anterior refractive power of the anterior surface of the body and the posterior (then modified) refractive power of the posterior surface of the body is equal to the target refractive error correction value.

[0047] The front surface is typically not modified in box 910 and therefore remains unchanged.

[0048] For example, in Box 910, the following steps can be performed: A semi-finished blank is obtained from Box 905. This is then glued. Before the lens can be ground to the desired prescription, it must be held securely. During blocking, a temporary block (often made of a special alloy or sometimes plastic) is attached to the front of the lens blank with hot glue. This block serves as a handle and provides a stable platform for the lens during the next steps. Then, the back (posterior surface) is modified. This may, for example, include the use of a lens cutting machine to cut the posterior surface to the desired desired curvature and thickness. In this process, the excess material is removed to achieve the desired prescription, which is based on the patient's eye parameters such as sphere, cylinder, and axis. Modern generators often use diamond-tipped tools or high-speed cutting tools. Polishing follows: After generation, the back surface of the lens is usually rough and needs to be polished to ensure clarity. The lens is placed on a polishing machine with a series of softer polishing tools and a special polishing paste. This is followed by edging. The lens is now shaped to fit the frame chosen by the patient. An edging machine is used to precisely cut the lens to the shape of the frame. Modern edging machines use a scanning system to map the interior of the frame and then cut the lens accordingly.Once the glass is ground, it can be inserted into the frame as described in Box 915.

[0049] In Box 915, the semi-finished ophthalmic lens is then system-integrated. This means that a pair of spectacles is manufactured. For example, the waveguide can be coupled to an electronic device with a display, and the semi-finished ophthalmic lens can be inserted into a frame of the spectacles with another semi-finished ophthalmic lens.

[0050] The invention can be further illustrated by the following examples.

[0051] In one example, a spectacle lens semi-finished product comprises a body having a front surface, a rear surface opposite the front surface, and two side surfaces, wherein the two side surfaces laterally connect the front surface and the rear surface to one another, and a waveguide configured to guide a virtual image into the body and to couple the virtual image out of the body at an output location. The body has a cavity extending from an opening in one of the two side surfaces into the body. The waveguide is arranged in the cavity at a distance from a surface of the cavity. The front surface has a front refractive power configured to define an imaging distance at which a virtual image coupled out of the waveguide is perceived. The rear surface has a rear modifiable refractive power.where a sum, the front refractive power and the rear modifiable refractive power correspond to a refractive error correction value, and wherein the rear modifiable refractive power is configured to set the refractive error correction value.

[0052] In the exemplary spectacle lens semi-finished product, a gap formed by the distance can be filled with air.

[0053] In the exemplary ophthalmic lens semi-finished product, the waveguide and the body can have the same refractive index.

[0054] In the exemplary ophthalmic lens semi-finished product, a plurality of holders may be arranged on a surface of the cavity, wherein each holder of the plurality of holders may have a refractive index equal to that of the body.

[0055] In the exemplary spectacle lens semi-finished product, an adhesive layer can be arranged in the distance, which is configured to connect the waveguide and the body.

[0056] In the exemplary spectacle lens semi-finished product, at least two of the adhesive layer, the waveguide and the body can have refractive indices that are matched to one another.

[0057] In the exemplary ophthalmic lens semi-finished product, one of the adhesive layer, the waveguide and the body may have a different refractive index.

[0058] In the exemplary ophthalmic lens semi-finished product, the adhesive layer may have a lower refractive index than the waveguide.

[0059] In the exemplary ophthalmic lens semi-finished product, a beam splitting coating can be applied to the waveguide, which is configured to split light rays depending on an angle of incidence.

[0060] In the exemplary ophthalmic lens semi-finished product, the beam splitting coating may comprise a plurality of successive first and second layers.

[0061] In the exemplary ophthalmic lens semi-finished product, the body may comprise plastic and the waveguide may comprise glass.

[0062] In the exemplary spectacle lens semi-finished product, at least one of the first surface and the second surface may have a coating, wherein the coating Layering one consists of a hard coating, an anti-reflective coating, a color cast coating, an ultraviolet (UV) protective coating and a polarizing coating.

[0063] In one example, data glasses comprise a display system configured to generate a virtual image and couple it into a waveguide, and at least one spectacle lens made from a spectacle lens semi-finished product according to any of the preceding exemplary spectacle lens semi-finished products by adjusting the refractive error correction value via the posterior modifiable refractive power.

[0064] A method for producing a spectacle lens semi-finished product is disclosed. The spectacle lens semi-finished product comprises a body having a front surface, a rear surface opposite the front surface, and two side surfaces. The two side surfaces laterally connect the front surface and the rear surface to one another. The spectacle lens semi-finished product further comprises a waveguide. The waveguide is configured to guide a virtual image into the body and to couple the virtual image out of the body at an output location. The body has a cavity. The cavity extends from an opening in one of the two side surfaces into the body. The waveguide is arranged in the cavity. This arrangement occurs at a distance from a surface of the cavity. The front surface has a front refractive power.The front refractive power is configured to define an imaging distance at which a virtual image coupled out of the waveguide is perceived. The rear surface has a rear refractive power. The method includes modifying the rear refractive power.

[0065] In one example, the posterior refractive power is modified based on a user's target refractive error correction value.

[0066] For example, the modification can be carried out in such a way that the sum of the anterior refractive power and the posterior refractive power after modification corresponds to the target refractive error correction value.

[0067] For example, the anterior refractive power cannot be modified depending on the target refractive error correction value.

[0068] Modifying the posterior refractive power may, for example, involve applying material to the posterior surface.

[0069] Modifying the posterior refractive power may involve removing material from the posterior surface.

[0070] The foregoing description was provided to illustrate the ophthalmic lens semi-finished product and the data glasses with ophthalmic lenses made from the ophthalmic lens semi-finished product. It should be understood that the description is in no way intended to limit the scope of the present disclosure to the precise embodiments discussed in the description. Rather, those skilled in the art will recognize that the examples of the present disclosure may be combined, modified, or simplified without departing from the scope of the present disclosure as defined by the following claims.

Claims

Claims 1. A spectacle lens semi-finished product (100), comprising: a body (101) having a front surface (110), a rear surface (140) opposite the front surface, and two side surfaces, wherein the two side surfaces laterally connect the front surface (110) and the rear surface (140); and a waveguide (130) configured to guide a virtual image into the body (101) and to couple the virtual image out of the body (101) at a coupling-out location, wherein the body (101) has a cavity (120) extending from an opening in one of the two side surfaces into the body (101), wherein the waveguide (130) is arranged in the cavity (120) at a distance from a surface of the cavity (120), wherein the front surface (110) has a front refractive power configured to define an imaging distance,in which a virtual image coupled out of the waveguide (130) is perceived, wherein the rear surface (140) has a rear modifiable refractive power, wherein a sum of the front refractive power and the rear modifiable refractive power corresponds to a refractive error correction value, and wherein the rear modifiable refractive power is configured to set the refractive error correction value.

2. Spectacle lens semi-finished product (100) according to claim 1, wherein a gap formed by the distance is filled with air.

3. A spectacle lens semi-finished product (100) according to any one of the preceding claims, wherein the waveguide (130) and the body (101) have the same refractive index.

4. A spectacle lens semi-finished product (100) according to any one of the preceding claims, wherein a plurality of holders are arranged on a surface of the cavity (120), each holder of the plurality of holders having a refractive index equal to that of the body (101).

5. Spectacle lens semi-finished product (100) according to claim 1, wherein an adhesive layer is arranged in the distance, which is configured to connect the waveguide (130) and the body (101).

6. Spectacle lens semi-finished product (100) according to claim 5, wherein at least two of the adhesive layer, the waveguide (130) and the body (101) have refractive indices that are matched to one another.

7. The spectacle lens semi-finished product (100) according to claim 6, wherein one of the adhesive layer, the waveguide (130) and the body (101) has a different refractive index.

8. The spectacle lens semi-finished product (100) according to claim 5, wherein the adhesive layer has a lower refractive index than the waveguide (130).

9. A spectacle lens semi-finished product (100) according to any one of the preceding claims, wherein a beam splitting coating is applied to the waveguide (130) and is configured to split light beams depending on an angle of incidence.

10. The ophthalmic lens semi-finished product (100) of claim 9, wherein the beam splitting coating comprises a plurality of successive first and second layers.

11. A spectacle lens semi-finished product (100) according to any one of the preceding claims, wherein the body (101) comprises plastic and wherein the waveguide (130) comprises glass.

12. The ophthalmic lens semi-finished product (100) according to any one of the preceding claims, wherein at least one of the first surface and the second surface has a coating, the coating being one of a hard coating, an anti-reflective coating, a color cast coating, an ultraviolet light (UV) protective coating, and a polarizing coating.

13. A series of spectacle lens semi-finished products (100) according to any one of the preceding claims, wherein the series comprises several types of spectacle lens semi-finished products with different front refractive powers.

14. Data glasses, comprising: a display system configured to generate a virtual image and couple it into a waveguide (130); and two spectacle lenses, wherein at least one of the two spectacle lenses is manufactured from a spectacle lens semi-finished product (100) according to any one of claims 1 to 12 by adjusting the refractive error correction value via the posterior modifiable refractive power.

15. A method for producing a spectacle lens semi-finished product (100), in particular the spectacle lens semi-finished product (100) according to any one of claims 1 to 12, wherein the spectacle lens semi-finished product (100) comprises a body (101) having a front surface (110), a rear surface (140) opposite the front surface, and two side surfaces, wherein the two side surfaces laterally connect the front surface (110) and the rear surface (140), wherein the spectacle lens semi-finished product (100) further comprises a waveguide (130) configured to guide a virtual image into the body (101) and to couple the virtual image out of the body (101) at a coupling-out point, wherein the Body (101) has a cavity (120) extending from an opening in one of the two side surfaces into the body (101), wherein the waveguide (130) is arranged in the cavity (120) at a distance from a surface of the cavity (120), wherein the front surface (110) has a front refractive power that is configured to define an imaging distance at which a virtual image coupled out of the waveguide (130) is perceived, wherein the rear surface (140) has a rear refractive power, the method comprising modifying the rear refractive power.

16. The method of claim 15, wherein the posterior refractive power is modified based on a user's target refractive error correction value such that a sum of the anterior refractive power and the posterior modified refractive power corresponds to the target refractive error correction value.

17. The method of claim 15 or 16, wherein the anterior refractive power is not modified.

18. The method of any one of claims 15 to 17, wherein modifying the posterior refractive power comprises applying material to the posterior surface (140).

19. The method of any one of claims 15 to 18, wherein modifying the posterior refractive power comprises removing material from the posterior surface.

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