A case of unilateral blue colour vision loss

摘要: We report the case of subject JC presenting with a curious unilateral loss in blue colour vision. was female, aged 21 years, and had normal visual acuity each eye. In left eye, hue discrimination normal: Farnsworth-Munsell (FM) 100-Hue total error score 20 Pick-ford-Nicolson anomaloscope matches were normal. right FM plot tritanopic axis 192 Pickford-Nicolson revealed extensive blue-green confusion. Clinical examination, including detailed neuro-ophthalmological assessment, otherwise There no evidence autosomal dominant optic atrophy, condition often associated short-wavelength loss. Visual evoked potentials intrathecal immunoglobulins also To assess opponent-colour function, test spectral sensitivities measured on white auxiliary field. Data for eye sensitivity large field abnormally lowered at short wavelengths suggesting absent or severely impaired blue-cone function. On spatially coincident field, however, there an absolute increase implying some residual function combination post-receptoral abnormality.