A corrective lens is a lens worn in front of the eye, mainly used to treat myopia, hyperopia, astigmatism, and presbyopia. Glasses or "spectacles" are worn on the face a short distance in front of the eye. Contact lenses are worn directly on the surface of the eye. Intraocular lenses are surgically implanted most commonly after cataract removal, but recently for purely refractive purposes. Myopia (near-sightedness) requires a divergent lens, whereas hyperopia (far-sightedness) requires convergent lens.
When ordering new spectacles, choosing the lenses is as important as choosing the frame. The choice need not be strictly dictated by the ophthalmologist's prescription; rather, the prescription is a starting point. Today, you can choose from a great variety of spectacle lenses. The same <
Here we would like to acquaint you with the basic, general parameters of quality for modern spectacle lenses. You might be already familiar with many of the lens features we describe below, but even in this case, we hope that our information about lenses will be useful and will help you choose high-quality, flawless eyewear.
Bifocals as the name suggests offers two focal lengths to the wearer namely distance and near. These lenses are usally required once a person crosses the age of 40 and the natural accommodation in the eye is reduced thus creating difficulty in focusing at near objects. These lenses will have a clear visible demarking between the two zones.