Keratoconus apex positions impact on visual acuity and contrast sensitivity

Sanita Liduma; Artis Luguzis; Gunta Krumina

doi:10.1117/12.2546319

1 April 2020 Keratoconus apex positions impact on visual acuity and contrast sensitivity

Sanita Liduma, Artis Luguzis, Gunta Krumina

Proceedings Volume 11359, Biomedical Spectroscopy, Microscopy, and Imaging; 113591W (2020) https://doi.org/10.1117/12.2546319
Event: SPIE Photonics Europe, 2020, Online Only

Abstract

The change of corneal shape in keratoconus subjects can impact the optical quality of the eye on the retina and it reduces the contrast sensitivity by light scattering. The aim of our study was to estimate the keratoconus subjects’ contrast sensitivity and visual acuity depending on keratoconus apex position. We included 45 keratoconus subjects (77 eyes), which have keratoconus in the first to the third stage, in our study. There were 33 eyes with keratoconus apex in the central part of the cornea and 46 eyes with keratoconus apex in the periphery of the cornea. Contrast sensitivity and visual acuity were measured at 3 m with and without the best possible spectacle correction using the FrACT program 3.9.3. The contrast sensitivity was measured at following frequencies – 1, 3, 5, 7, 9, 11, 13, and 15 cpd. The results showed that keratoconus subjects have lower contrast sensitivity in all spatial frequencies than subjects without pathological changes. The lowest contrast sensitivity was in keratoconus subjects with a central apex position compared to contrast sensitivity with peripheral apex position. The difference of contrast sensitivity between subjects with and without pathology increased up to 11 cpd but remained rather constant at the highest spatial frequencies – 11, 13, and 15 cpd. There was statistically significant difference between the median of visual acuity in subjects with central apex (0.42 decimal system) and subjects with peripheral apex (0.60 decimal system).

Conference Presentation

Citation Download Citation

Sanita Liduma, Artis Luguzis, and Gunta Krumina "Keratoconus apex positions impact on visual acuity and contrast sensitivity", Proc. SPIE 11359, Biomedical Spectroscopy, Microscopy, and Imaging, 113591W (1 April 2020); https://doi.org/10.1117/12.2546319

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available