How do glasses work?
In: Technology
Depending on your exact issue with vision, you may not be able to see objects close to you or at a distance. This is caused by an issue with the lens of your eye being unable to focus light effectively on your retina. If near-vision is a problem for you, this means your eyes focus light onto a point that is ‘before’ your retina. In this case, concave glasses which cause rays of light to diverge from each other, allows for light to be focused correctly on the retina by the lens of your eye. If far-vision is a problem, the lens focuses light on a point ‘after’ the retina. In this case, the glasses will be convex. The lens of your eye then finishes the job, and focuses light on the retina correctly. Bifocals work by having convex and concave lenses in different parts of the spectacles.
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