Purpose: To study possible differences in colour contrast sensitivity between different intraocular lens (IOL) materials with consecutive same day cataract su rgery performed in the right and left eyes. Methods: Central colour contrast sen sitivity was measured with a computer graphics system along the protan, deutan a nd tritan axes. Thirty-four patients with cataract were studied. The patients w ere randomized to one of three groups: group 1 received a Clariflex (silicone) l ens in one eye and an Akreos Fit (hydrophilic acrylic) lens in the other; group 2 received an Akreos lens in one eye and a Sensar AR40e (hydrophobic acrylic) le ns in the other, and group 3 received a Clariflex lens in one eye and anAR40e le ns in the other. Surgery was performed in both eyes on the same day. A postopera tive questionnaire was distributed, asking the patients to describe any differen ces experienced between their two eyes. Results: There were no significant diffe rences between the three different IOLs in any colour axis. There were no compli cations of importance during surgery. Thirty-two of the 34 patients answered th e questionnaire. Twenty-one patients experienced some difference between their two eyes in distance vision and 23 noticed differences in near vision. For dista nce vision, nine reported better vision in the eye with the Akreos IOL, eight in the eye with the Clariflex IOL lens and four in the eye with the AR40e IOL. For near vision, 12 preferred theAkreos lens, eight the Clariflex lens and three th e AR40e lens. Conclusion: There were no significant differences between the thre e different IOLs in any colour axis.
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