The present invention consists of a set of sunglasses used for locating shark teeth on a beach. The invention takes advantage of the way the human brain generates images in order to make shark teeth stand out on the sand. It does so by blocking out specific wavelengths of light that help to accentuate color differences between the teeth and the underlying beach surface. Shark teeth undergo a change of color after falling out that causes them to be differentiable in shade from sand or sediment. By selectively filtering corresponding shades of light, the present invention causes the teeth to stand out as spots on the sand, significantly increasing the ease of spotting and collecting them. When the wavelengths of light reaching the eye are filtered, the shark teeth ultimately stand out as stark dark areas on the beach.

The present invention relates to ophthalmic and non-ophthalmic systems with blue light filtering and Yellowness Index ranges. UV and IR filtering are also included. Industrial applications are also outlined in the invention.

The present invention relates to a manufacturing method for a mid-infrared lens, which includes the following steps: placing a lens in the path of a far-infrared radiation source, enabling the lens to receive the far infrared rays; immersing the lens in a hardening liquid, causing the hardening liquid to coat the lens, wherein the hardening liquid is an intermixture of silicone and isopropanol or an intermixture of silicone and methanol, and a far-infrared material or a far-infrared composite material is additionally added to the hardening liquid; placing the lens coated with the hardening liquid in a drying space to dry, causing the hardening liquid to dry and harden and form a hardened layer on the surface of the lens. The temperature of the drying space lies between 80 and 120° C., and the drying time lies between 1 and 10 hours.

Provided is a selectively filtered vision protection system for defense against aircraft laser threats. The system comprises a viewing device having a frame supporting a transparent viewing surface. The frame is configured to be positioned on the face of a user such that the user may see through the viewing surface. A selective filter is positioned adjacent to the viewing surface such that the angle of the field of view of the user is regulated in at least one orthogonal plane. The viewing angle is selected to prevent light transmitted from a light source, located outside of the viewing angle, from being viewed by the user. The selective filter is configured to operate in a first mode for transmitting light unrestricted through the viewing surface, and a second mode to regulate the angle of the field of view of the user in at least one orthogonal plane.

An optical lens device includes a lens body, an optical filter and an optical absorbance portion. The lens body has a first lens surface and a second lens surface between which to form the optical filter where is to provide the optical absorbance portion. The optical absorbance portion includes a first main absorbance area having a first absorbance peak portion and a second main absorbance area having a second absorbance peak portion. The first main absorbance area has a first wavelength range between 420 nm and 440 nm formed as a high-energy blue UV absorbance area while the second main absorbance area has a second wavelength range between 580 nm and 610 nm.

Disclosed is a method for determining a filter for a visual equipment to be placed in front of the eye of a user to improve visual comfort and/or visual performance of the user, the method including: determining the spectral transmittance of an ocular media of an eye; and determining a filter based on the determined spectral transmittance of the ocular media so the filter has a spectral transmittance profile including: a first portion having a maximum transmittance value between 380 nm and a predetermined threshold, and a second portion with a decreasing transmittance value between the threshold and 670 nm. Also disclosed is a filter whose spectral transmittance is calculated based on the spectral transmittance of the user's ocular media, as well as a set of filters with each filter in the set having a spectral transmittance based on the spectral transmittance of the ocular media of users having different ages.

A user-wearable fluorescence based visualization system comprising a multi-light lamp assembly that provides for the selected output of light using multiple light emitting sources, wherein the outputted light may be tailored to generate response wavelength by the interaction of the emitted light and a tissue illuminated by the emitted light, through the process of fluorescence, and a viewing system that allows a practitioner view the fluorescent light generated by the tissue, and distinguish between healthy and diseased tissues.

Described are multifocal contact lenses that contain high energy visible (HEV) light absorbing compounds and their use for improving one or more vision attributes.

Methods and apparatus are provided for eyeglass lens made using a solution casting process. The method may include providing a first soluble polymer solution. The method may include providing a first dye solution including at least one dye. The method may include adding the first dye solution to the first soluble polymer solution to form a first dyed solution. The method may include casting the first dyed solution to form a first film. The method may include providing a second soluble polymer solution. The method may include providing a second dye solution comprising at least one dye. The method may include adding the second dye solution to the second soluble polymer solution to form a second dyed solution. The method may include casting the second dyed solution onto the first film to form a two-layer film. The method may include laminating or casting the two-layer film to the eyeglass lens.

The radiation-curable coating compositions disclosed herein are provided for use as photo-stable coatings for an optical article substrate. The compositions may be applied by a variety of methods, including spin coating, dip coating, and inkjet coating. The coating compositions are fast cured and exhibit robust adhesion to the substrates.