We report a case of controlled buccal pemphigus vulgaris with compound moderate myopia with astigmatism that was treated with photorefractive keratectomy with mitomycin-C (PRK+MMC) in both eyes. The preoperative manifest refraction was -6.50 sphere and -5.5 -0.75 x 20 in the right eye and left eye, respectively, with a best corrected visual acuity of 10/10 in both eyes. Seven months after surge...

The capabilities of photorefractive crystals as media for holographic interconnections in neural networks are examined. Limitations on the density of interconnections and the number of holographic associations which can be stored in photorefractive crystals are derived. Optical architectures for implementing various neural schemes are described. Experimental results are presented for one of the...

A time resolved study of the behavior of a single beam in photorefractive iron doped indium phosphide is provided down to the microsecond range, showing that infrared beam bending does occur on the micro-second time scale for moderate beam intensities. Two distinct time scales are evidenced, the behavior of which are the sign of two different photorefractive mechanisms.

to compare the refractive and visual outcomes and higher order aberrations in patients with low to moderate myopia who underwent customized photorefractive keratectomy (prk) or  femtosecond laser in situ keratomileusis (femto-lasik) this study performed this research includes data of 120 consecutive eyes of 60 patients with myopia between -3.00 d and -7.00 d with or without astigmatism in two s...

purpose : to assess the safety, efficacy and predictability of photorefractive keratectomy (prk) [tissue-saving (ts) versus plano-scan (ps) ablation algorithms] of technolas 217z excimer laser for correction of myopic astigmatism methods : in this retrospective study one hundred and seventy eyes of 85 patients (107 eyes (62.9%) with ps and 63 eyes (37.1%) with ts algorithm) were included. ts al...

In this presentation “A comparative study on visual and optical performance of Akreos AO and Kontur AB IOLs, after phacoemulsification cataract surgery”, Gharaee H et al have evaluated the visual performances by comparing two aspheric intraocular lenses (IOL). They indicate that with age positive spherical aberration increases, and consequently mesopic contrast sensitivity decreases and in such...

Intervalley scattering of hot electrons during high-field transport in transverse-field photorefractive quantum wells induces a nonlocal optical response in which photoinduced changes in the refractive index are spatially shifted relative to the optical stimulus, providing an avenue for optical gain. We demonstrate that the onset of the photorefractive phase shift coincides with the onset of ve...

purpose: to evaluate the 8-year results of excimer laser photorefractive keratectomy (prk) for myopia in terms of safety, stability and late complications. methods: of 203 myopic patients who underwent prk with single-step method using nidek ec-5000 excimer laser with 5-6 mm ablation zones at basir eye center, tehran-iran from 1996 to 1998, 179 eyes of 98 patients who completed 8 years of follo...