A recent visit to my ophthalmologist included the assessment of several lens options to allow my eyes to focus at 20/20 visual acuity (the clarity or sharpness of vision). A combination of lenses are necessary to achieve this optimum condition—one for reading, one for viewing objects clearly at a distance, one for computer work, and finally darkened lenses that allows me to keep my eyes open in the sunlight. My new lenses work wonderfully if I place them over my eyes; they are useless when stored in their cases.