R Lukauskiene¹, V Viliunas²
¹Kaunas Medical University Clinic, Neurosurgical, Kaunas, Lithuania; ²Vilnius University, Informatics, Vilnius, Lithuania
Background. Special computerized programs were used to analyze colour vision function in patients with low vision. The computerized Farnsworth-Munsell(F-M)100 test and the colour threshold test were devised.
Methods. Hue discrimination and colour determination thresholds were measured in 64 patients with optic nerve atrophy caused by different etiological factors. (F-M)100 test and the colour threshold test were used. Monitoring of colour perception was performed before and after treatment. Eight persons performed the line of test series before and after treatment procedures: transcutaneal electrostimulation and drug therapy. Data of tests were marked in database and changes of colour vision were shown on the screen of PC in graphic form.
The results were analyzed according to: i) the mean of F-M 100 test error scores; ii) the mean of colour determination thresholds; iii) colour deficiency type as revealed by the F-M 100 test; iv) colour deficiency as revealed by the colour thresholds test.
Results. 1.Sensitivity to red and green colour is 1,8 times more affected in optic nerve atrophy than sensitivity to blue. 2.Correlation exists between F-M 100 test mean error score and the mean of colour threshold (correlation coefficient 0,81). 3.Patients who received some type of treatment in 8,5 percent of cases showed better results in the last series of tests.
Conclusion. Monitoring of colour vision in low vision patients with optic nerve atrophy is a sensitive method for the evaluation of the visual function dynamics in treatment process, even if visual acuity or visual fields remain intact. The computerized colour discrimination testing system is informative device for determination the severity of the optic nerve atrophy and follow up the disease.
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