Visual Acuity and Contrast Sensitivity Depending from Keratoconus Apex Position

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

Contrast sensitivity and higher-order aberrations in Keratoconus subjects

“…Research on contrast sensitivity changes in keratoconus is limited. Some authors have confirmed that contrast sensitivity is reduced in keratoconus subjects compared to normal controls 14 , 17 , 18 . Likewise, contrast sensitivity at medium and high frequencies was shown to be reduced in keratoconus subjects before visual acuity decreases 19 .…”

Cilvēka fizioloģijas un uztveres aktuālie pētījumi 2020. gadā : rakstu krājums

“…Keratokonusa pacientiem ir statistiski nozīmīgi samazināta kontrastjutība vidējās un augstās kontrastjutības telpiskajās frekvencēs (Liduma & Krumina, 2017), gan atkarībā no keratokonusa stadijas, gan no keratokonusa virsotnes atrašanās vietas. Tas liecina, ka keratokonusa pacientiem jābūt atšķirībām augstākās kārtas aberācijās.…”