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Visual Acuity and Contrast Sensitivity Depending from Keratoconus Apex Position

2017

Abstract Various studies have demonstrated that patients with keratoconus have significant loss of contrast sensitivity while its value varies in different studies. None of these studies has analysed reduced contrast sensitivity depending on the position of apex of corneal conus. Visual acuity and contrast sensitivity were evaluated for patients with keratoconus using the FrACT software. Contrast sensitivity was assessed at the following frequencies: 1, 3, 5, 7, 9, 11, 13, and 15 cycles per degree (cpd). Twenty-four eyes with keratoconus were analysed. Contrast sensitivity was significantly lower for patients with the apex at the centre compared with apex on the periphery both with (p = 0.0…

contrast sensitivityKeratoconusmedicine.medical_specialtyMultidisciplinaryVisual acuitygenetic structuresGeneral interestbusiness.industrykeratoconusSciencemedia_common.quotation_subjectQapex on the peripherymedicine.diseaseeye diseasesApex (geometry)apex at the centreOpticsOphthalmologymedicineContrast (vision)medicine.symptombusinessSensitivity (electronics)media_commonProceedings of the Latvian Academy of Sciences. Section B. Natural, Exact, and Applied Sciences.
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