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Contrast sensitivity is very important regarding cataracts. Cataract basically is an opacity of the lens that scatters light back to the eye, what that standard light does reduce contrast and that is what we see with; it’s the difference between the target and the background. When a cataract starts developing, it can develop in any different forms and shapes and it is really not the physical look that the doctor has that’s going to tell him the functional significance, you really have to measure with contrast sensitivity and adding glare and that now provides a very good measure of the functional loss due to this cataract this lens to the patient.