Dr. Boothe
Undercorrection. This is the least advisable option. The distance vision is intentionally not fully corrected, which allows for usable vision at mid-ranges. This results in slightly strained vision for near, and moderately blurry vision for very far distances. A low powered pair of glasses is worn for activities such as driving to sharpen distance vision.
Medical researchers are pursuing several options that may assist in refocusing the eyes for multiple distances or better yet, aid in the partial restoration of near visual function. Presbyopia may have multiple causes. It is commonly believed that the loss of flexibility of the crystalline lens (which is located behind the pupil), or loss of tension and strength of the muscles that flex the lens, are the main contributing factors of near vision decline. At this time there are no approved procedures that correct presbyopia, but hopefully within this decade new options will become clinically tested and FDA approved.
