Pupil response test to chromatic light
This test can detect retinal and optic nerve abnormalities in a timely manner even before vision problems occur. Different colors of light have different wavelengths and stimulate different photoreceptors in the eye. Pupil testing for chromatic light is a regular part of every ophthalmological examination.
This diagnostic method is extremely important for patients who have lost their vision, or have impaired day or night vision, and the examination of the eye has not determined any cause for loss or impairment of vision. The ERG finding can then help us in the diagnosis, and thus in choosing the correct therapy. In patients with cataracts where the front of the eye is opaque, an ERG is performed to evaluate retinal function.