The symptomatic Pulfrich phenomenon can be successfully managed with a coloured lens in front of the good eye--a long-term follow-up study.

PURPOSE: Many visual symptoms originating from a spontaneous Pulfrich phenomenon can be alleviated by the provision of a tinted lens worn in front of the least affected eye. Here, we report on the long-term outcome of four patients who have been provided with a uniocular tinted spectacle or contact lens.
METHODS: The case notes of four cases were reviewed. The review period was at least 5 years in all four cases.
RESULTS: In all cases, visual symptoms and perceptual difficulties occurring from the spontaneous Pulfrich effect were completely eliminated over a period of many years. In one case, the relief has been sustained over a 20-year period.
CONCLUSIONS: A uniocular tinted lens, or contact lens, provides immediate and lasting relief from the visual difficulties caused by the visual delay underlying the spontaneous Pulfrich effect.