Chapter-04 Conductive Keratoplasty

BOOK TITLE: Recent Advances in Ophthalmology—9

1. Du Ted T
Publishing Year
Author Affiliations
1. Mount Sinai School of Medicine, New York, NY USA
Chapter keywords


Presbyopia is defined as physiologically blurred near vision, commonly evident around age 40, due to gradual loss of accommodation. An emmetropic person will complain inability to read small print or differentiate fine close objects, which is usually worse in dim light or when one is tired. Although the symptoms stabilize after age 55, they will persist for one’s lifetime. Conventional nonsurgical correction of presbyopia includes reading glasses, biofocal glasses, trifocal glasses, or progressive lenses. Monovision contact lens is an option for patients who wish to avoid spectacles with a success rate of 76%. It is a relatively new concept that corrects one eye for distance and the fellow eye for near. “Blended vision” is monovision after surgical corrections. It offers less compromise of reduced peripheral visual field, contrast sensitivity, and depth perception, which are generally the reasons for failure of monovision. Surgical procedures for correcting hyperopia and presbyopia include PRK, LASIK, noncontact or contact LTK, multifocal IOLs, accommodative IOLs, intracorneal implants, thermokeratoplasty, diode laser keratoplasty, and procedures that expand or relax the sclera. Laser-based refractive surgery has been the mainstream treatment in recent years. A large patient population, especially over the age of 40 has avoided the procedure in the past either because they are not good candidates or due to the fear of potential complications of LASIK or PRK.

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