Undetectable S cone electroretinogram b-wave in complete congenital stationary night blindness.
case_report · Level V
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- Record sourced from PubMed, PMID 8795377.
- Also identified by PMC identifier 505559.
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Abstract
The short wavelength sensitive (S) cone electroretinograms (ERGs) were examined in two patients with the complete type of congenital stationary night blindness (CSNB). Ganzfeld spectral flashes in the presence of strong white adapting fields were used to elicit the S cone ERGs. The S cone ERG b-wave was not detectable to short wavelength stimuli, while the mixed long (L) and middle (M) wavelength sensitive cone responses appeared normal in waveforms with normal amplitude in both patients. Both patients had normal colour vision on the Farnsworth Panel D-15. These ERG results indicated that the S cone system as well as rod system is more impaired in complete CSNB than the L and M cone system and that normal colour vision may not depend on a normal S cone ERG to full field stimuli.
Medical subject headings
- Night Blindness
- Retinal Cone Photoreceptor Cells