Optical Corrections for Low Visual Acuity

Correlation between Visual Acuity and Optical Coherence Tomography-Measured Retinal Thickness in Diabetic Macular Edema

Background and Objective: Diabetic macular edema (DME) is one of the common complications of diabetes which significantly accounts for preventable visual impairment and blindness. Central macular thickness (CMT) is a feature found in DME patients. This study aims to determine the relationship between optical coherence tomography (OCT)-measured CMT and visual acuity (VA) in patients with DME bef...

Low visual acuity and asteroid hyalosis

A 56 years old man was admitted to the ophthalmology department for low visual acuity since his 45 years old with no amelioration after optic correction. The physical exam found visual acuity at 1/10 on the right eye and 9/10 on the left one, clear cornea, intraocular pressure at 14 mmhg on both eyes, the fundus of the right eye showed multiple yellow mobile vitreous particles that are absent o...

Standards for Visual Acuity

Visual acuity and optical parameters in progressive-power lenses.

PURPOSES The purposes of this study are to explore the effect of astigmatism and high-order aberrations of progressive-power lenses (PPLs) on visual acuity (VA) and to find a good optical metric for evaluating visual performance of PPLs. METHODS A Hartmann-Shack (HS) wavefront sensor was used to measure PPLs and human eyes either independently or in combination. An additional channel permits ...

Chart for visual acuity screening.

SIR, -I read with great interest the paper by Wong and Kaye on a suggested chart for visual acuity screening.' However, I was surprised to find that they recommended widespread clinical use of this chart without any clinical data to confirm its suitability. The statistical argument they use is compelling, but surely a comparison with other methods of acuity testing should be undertaken to confi...