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A visual test chart that "bypasses" the optics: Letters-in-Noise, Mark 2

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The typical patient for cataract surgery is elderly. Since cataracts are not life threatening, the decision to operate depends on a cost-benefit analysis. The cost is the relatively small risk of the operation. The benefit is improved vision, but that depends on the health of the rest of the visual system, which can be difficult to assess in the presence of the obscuring cataract.

© 1990 Optical Society of America

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