Check Out Our Vision Care Glossary

Complete Eye Care Dictionary

Learning about your eye health can be confusing and complicated. To simplify things for you, Northern Illinois Optical Co Inc has created its own vision care glossary. 

Browse through our comprehensive library of vision-related information that'll help you better understand how your vision works and more.
Eye check-up


It is an eye condition where the eye cannot focus light uniformly in all directions resulting from an irregular curvature of the cornea, the crystalline lens, or the eye itself. It results in mild to moderately blurred vision or eyestrain.


A cataract is a clouding of the crystalline lens of the eye that makes it hard for light to pass through and be focused properly. 

In a normal eye, the crystalline lens is almost transparent, but injury, age, or disease can cause the lens to eventually lose its clarity. When the lens becomes opaque, it is called a cataract. It can be treated by surgery.
Eye care

Take a Look at Our Full Glossary

Read on to learn more about the anatomy of your eye, conditions of the eye, and eye correction technologies. View our glossary of eye care terms!
Visit us today at 121 N. Madison Street, Rockford, IL 61107 for Complete Eye Care.
Call us at 815-963-3454 to learn more about vision care.
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