Ophthalmic inspection lens
Single piece ophthalmic inspection devices are provided having a continuous 3-dimensional molded surface preferably made out of plastic. The devices are relatively easier and cheaper to manufacture than existing inspection lenses. The smooth continuous edges are advantages to prevent damage to tissue as well to stop foreign objects accumulating in e.g. the clear regions of the lens. Ergonomic features are built into the ophthalmic inspection device provide for superior control of the device on the patient's eye. In addition, textured knurled or grooved surface provide desired finger grip and control of the device.
1. An ophthalmic inspection lens comprising:
a circular central optically clear region having a concave tissue interface surface and a convex inspection surface;
a tubular cylindrical handle concentric with the optically clear region, protruding laterally from the convex inspection surface, and extending parallel to an optical axis of the lens beyond the convex inspection surface;
a ring-shaped base concentric with the optically clear region and abutting a rim of the concave tissue interface surface; and
a finger rest shelf disposed between and protruding laterally from the tubular cylindrical handle and the ring-shaped base;
wherein the lens is a single piece of injection molded plastic, and outer surfaces of the lens in a region from the finger rest shelf to the ring-shaped base are molded with a frosted texture preventing internal reflection of light from those surfaces into the central optically clear region.
2. The ophthalmic inspection lens of claim 1 , wherein the frosted texture prevents transmission of images from external light sources through those surfaces into the optically clear region.
3. The ophthalmic inspection lens of claim 1 , wherein outer surfaces of the tubular cylindrical handle are molded with a texture improving finger grip.
4. The ophthalmic inspection lens of claim 3 , wherein the molded texture of the outer surfaces of the tubular cylindrical handle comprises a repeating pattern of molded grooves running orthogonally to a mold parting line on the inspection lens.
5. The ophthalmic inspection lens of claim 1 , comprising a mold parting line located at a widest diameter of the finger rest shelf.
6. The ophthalmic inspection lens of claim 1 , wherein the finger rest shelf comprises an indication of the orientation of the ophthalmic inspection lens.
7. The ophthalmic inspection lens of claim 1 , wherein the outer side of the tubular cylindrical lens handle comprises an indication of the orientation of the ophthalmic inspection lens.