Negative scotopic ERG and photopic ERG ON response impairment in a patient with normal dark adaptation.
OBJECTIVE
To present ocular findings in a patient who showed negative scotopic electroretinogram (ERG) and reduced ON response, but normal dark adaptation.


METHODS
An 18-year-old Japanese male patient who complained of severe asthenopia. His corrected visual acuities were 1.2 in both eyes. His fundi were normal. He had normal contrast sensitivity and normal dark adaptation.


METHODS
The patients underwent ERG (including the standard protocol and photopic long flash recordings).


RESULTS
The amplitudes of the rod ERG b-wave were reduced. The scotopic standard combined ERG response showed negative configuration. The photopic response to long flash revealed the reduced b-wave (ON response), while the amplitude of the first peak of the d-wave (OFF response) was within the normal range.


CONCLUSIONS
Postsynaptic abnormalities in both the rod and cone ON-pathways, which are often found in patients with night blindness, were suggested in the ERG findings, but the dark adaptation of our patient was normal. Neuromuscular evaluation of the patient and ophthalmological evaluation, including ERG, of his parents were normal. To our knowledge, the ophthalmological and electrophysiological findings of our patient cannot be attributed to any known clinical entity.
Tanimoto
Naoyuki
N
Division of Ophthalmology and Visual Science, Graduate School of Medical and Dental Sciences, Niigata University, 1-757 Asahimachi, Niigata, 951-8510, Japan. naoyuki.tanimoto@med.uni-tuebingen.de
Usui
Tomoaki
T
Ichibe
Mikio
M
Kuze
Manami
M
Takagi
Mineo
M
Hasegawa
Shigeru
S
Sato
Masahisa
M
Tanaka
Keiko
K
Abe
Haruki
H
D000221:Adaptation, Ocular; D000293:Adolescent; D001248:Asthenopia / Q000175:diagnosis* / Q000503:physiopathology; D003623:Dark Adaptation; D004596:Electroretinography / Q000379:methods*; D006801:Humans; D008297:Male; D010775:Photic Stimulation / Q000379:methods; D014792:Visual Acuity