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[Case of unilateral impairment of short-wavelength sensitive cone with sudden onset]
Takashi Okuno1, Masahiro Minami, Hidehiro Oku
1Department of Ophthalmology, Korigaoka-yukeikai Hospital, Miyanoshita-cho, Hirakata-shi, Osaka-fu 573-0046, Japan. takashi@poh.osaka-med.ac.jp
Background:
Compare to either the middle or the long cones, short cones (S-cone) are easily damaged.
Case:
A 62 year-old men complained of acute tritan OS. The corrected visual acuity was 1.2 OU. Routine ocular examinations showed no remarkable abnormalities, but we detected impaired responses using S-cone ERG and blue-on-yellow perimetry OS. We diagnosed this case as acute damage of the blue cone.
Conclusion:
S-cone damage can be determined by electro-physiological and psychophysical examinations in cases of unilateral color abnormality.
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