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Retinal scan. A retinal scan is a biometric technique that uses unique patterns on a person's retina blood vessels. It is not to be confused with other ocular-based technologies: iris recognition, commonly called an "iris scan", and eye vein verification that uses scleral veins.
Corrective lens. A corrective lens is a transmissive optical device that is worn on the eye to improve visual perception. The most common use is to treat refractive errors: myopia, hypermetropia, astigmatism, and presbyopia. Glasses or "spectacles" are worn on the face a short distance in front of the eye.
Distance PD is the separation between the visual axes of the eyes in their primary position, as the subject fixates on an infinitely distant object. Near PD is the separation between the visual axes of the eyes, at the plane of the spectacle lenses, as the subject fixates on a near object at the intended working distance.
Even people who don't need eyeglasses for vision issues are donning specs these days. While some may be using non-prescription glasses as a fashion statement, others may actually be using blue ...
Experts say there are ways to improve visual comfort without the glasses: Vary the types of things you are focusing on, or your field of vision. Looking at a computer all day only engages a ...
“The No. 1 thing is having a routine eye exam and a full eye assessment — not only for glasses or prescriptions, but also the health of the eyes,” says Adair.