Unilateral intraocular lens. Matching brightness and colour perception against the phakic healthy fellow eye

A combination of yellow and neutral filters was placed in front of an eye with IOL in order to find a colour and brightness match with the healthy phakic fellow eye. A Munsell standard blue pigment colour target was used as a test. Nine persons with a unilateral IOL were examined. The yellow Schott filter GG 420 was chosen by 2 observers, GG 435 by 5 and GG 455 by the remaining 2. In combination with the yellow filter a Schott neutral filter 0.1 NG was preferred by 3 observers, and each of the neutral filters 0.3 NG, 0.45 NG and 0.6 NG was chosen by 2 observers. The luminance of the coloured test target was measured to be 120 cd/m2 without filters and 86 to 31 cd/m2 as measured through the selected filter combinations.