Open AccessKeratoconus associated with congenital stationary night blindness type 1
Author(s) -
Dan Q Nguyen,
C Hemmerdinger,
Richard Hagan,
M. W. Brown,
Say Aun Quah,
Stephen B. Kaye
Publication year - 2009
Publication title -
bmj case reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.231
H-Index - 26
ISSN - 1757-790X
DOI - 10.1136/bcr.11.2008.1203
Subject(s) - keratoconus , medicine , ophthalmology , corneal topography , electroretinography , ectasia , astigmatism , cornea , optometry , retinal , surgery , optics , physics
A 35-year-old man presented with keratoconus; his best corrected visual acuities were -18.00/+10.00 ×180 (6/60) oculus dexter and -10.00/+8.00 ×5 (6/36) oculus sinister. Bilateral steep central corneal thinning, paracentral ectasia and Vogts striae were present. Normal fundi. Corneal topography disclosed 7.4 dioptres of irregular astigmatism in the central 3 mm with thinning (335 μm). Electroretinography (ERG) showed no response. There were no medical or environmental influences for his keratoconus. Occurrence of keratoconus and congenital stationary night blindness (CSNB) in the patient may represent a chance association, but keratoconus has not been previously linked with CSNB1 either as a chance or true association though both show genetic predisposition.