ABSTRACT
Vision is one of the most important human sensations about the surrounding world. Visual deprivation not only markedly affects the life of blind people, but also gives a heavy burden to their family and the society. A visual prosthesis is an electronic device that helps the blinds to regain visual perception by directly stimulating the visual pathway using the microelectrodes implanted into the body. In recent years, visual prostheses have been developed rapidly and some devices have already become clinically available. In this paper, we reviewed the history of visual prosthesis, introduced different visual prostheses classified according to the location of the implanted stimulating electrodes. Clinical study results as well as the functional status of the currently available visual prosthesis devices were also summarized.
Subject(s)
Visual Prosthesis , Blindness , Electrodes, Implanted , Humans , Microelectrodes , Visual PerceptionABSTRACT
OBJECTIVE: To investigate the change of retinal image magnification and its relationship to post-operative best corrected visual acuity (BCVA) after implanting phakic anterior chamber intraocular lens for extreme high myopia. METHODS: 30 eyes in 23 patients with -15.13 to -29.00 Diopter (D) of myopia were implanted. The magnification change of retinal image was calculated with ZEMAX software. The relationship among myopic diopter, magnification change, BCVA, and post-operative BCVA improvement were analyzed. RESULTS: The post-operative BCVA improved by 1 or more lines in 28 of 30 eyes (93%) at 3 months. 2 eyes (7%) no change of BCVA. There was positive correlations between myopic diopter and magnification change (r = 0.996, P < 0.01), and magnification change and post-operative BCVA improvement (r = 0.42, P = 0.02). There was negative correlations between myopic diopter and pro-operative BCVA (r = -0.62, P < 0.01), and post-operative BCVA (r = -0.57, P < 0.01). CONCLUSION: Magnification change was one of reason for post-BCVA improvement. There is a positive correlation between Magnification change and post-BCVA improvement.
