Illustration developed by Edmond H. Thall, MD, and Kevin M. Miller, MD, and rendered by C. H. Wooley.
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Refractive Mgmt/Intervention
Light traveling the shorter distance from object (O) to image (I) point traverses a thick part of the lens. Light traveling the longer path 2 goes through less glass. If the lens is properly shaped, the greater distance in air is perfectly compensated for by the shorter distance in glass, and the time required to travel from object to image is identical for both paths