Do Corning Filters Improve Visual function?

Nuclear sclerotic cataracts are one of the most common causes of decreased vision and increased sensitivity to light. This type of lens opacity occurs in "60 - 65% of the population age 50 - 59 years, 83% in the age group 60 - 69 years, 91% in the 70 - 79 year age group and 100% in the age group over 80 years." Glare from sunlight, reflections and headlights is the most bothersome and disabling sequela of nuclear sclerotic cataracts. Color vision, stereo acuity,visual acuity and light adaptation time may also be affectedwith such lenticular changes. But it is glare complaints or decreased vision that brings the patient into the
optometrist's office. The patient's subjective visualcomplaints have recently become a legitimate indication for cataract extraction. "Contrast sensitivity and glare disability measurements have been proposed as supplying supporting psychophysical evidence for the need for surgery in cataract patients who retain relatively good V.A." Cataract surgery is now considered a safe, successful and fairly simple procedure. However, not all patients are good candidates for the surgery. There are physical, emotional, and financial barriers that must be considered. For those patients who are not able or willing to undergo cataract surgery, Corning has developed a filter to improve their quality of vision. The aim of this study is to prove the vision-enhancing effects of this filter.