Investigative ophthalmology & visual science
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Invest. Ophthalmol. Vis. Sci. · Jul 2012
Visual performance with wave aberration correction after penetrating, deep anterior lamellar, or endothelial keratoplasty.
To investigate the contribution ocular aberrations have on visual performance by quantifying improvements in best-corrected visual acuity (VA) and contrast sensitivity (CS) obtained with higher-order aberration (HOA) correction after penetrating (PK), deep anterior lamellar (DALK), or Descemet's stripping automated endothelial keratoplasty (DSAEK). ⋯ PK eyes had better logMAR VA than that of DSAEK eyes with LOA correction, whereas DALK eyes performed intermediate between the two. When full correction was applied, the same trend persisted. The findings suggest that factors other than aberration contribute to decrements in VA with DSAEK compared with PK.
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Invest. Ophthalmol. Vis. Sci. · Jul 2012
Retinal vein pulsation is in phase with intracranial pressure and not intraocular pressure.
As efforts to noninvasively measure intracranial pressure (ICP) increase, we thought it important to investigate the timing of retinal venous pulsation in relation to the intraocular and intracranial pressure pulses. ⋯ During pulsation, central retinal vein collapse occurs in time with IOP and ICP diastole. Venous collapse is not induced by intraocular systole. These results suggest that ICP pulse pressure dominates the timing of venous pulsation.
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Invest. Ophthalmol. Vis. Sci. · Jul 2012
The prevalence and causes of visual impairment in an elderly Chinese Bai ethnic rural population: the Yunnan minority eye study.
To assess the prevalence and causes of visual impairment in the elderly Bai ethnic group in rural China. ⋯ A higher rate of visual impairment was seen in this Bai nationality sample than has been reported from the Han nationality population in rural China. Since potentially treatable eye disease, cataract, and uncorrected refractive error were the most important causes of visual impairment in this population, affordable provision of surgery and low-vision rehabilitation programs would help to address this problem.
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Invest. Ophthalmol. Vis. Sci. · Jul 2012
The association between time spent outdoors and myopia using a novel biomarker of outdoor light exposure.
We sought to determine whether conjunctival ultraviolet autofluorescence (UVAF), a biomarker of outdoor light exposure, is associated with myopia. ⋯ Study authors identified a protective association between increasing UVAF and myopia. The protective association of higher UVAF against myopia was stronger than that of increased levels of time spent outdoors as measured by this study's questionnaire. Future studies should investigate the association between UVAF and incident myopia, and its relationship to myopic progression.