AIM: To compare the contrast vision following implantation one of the following three intraocular lenses(IOLs): photochromic IOL, blue-light filtering IOL and conventional clear IOL.

METHODS: Totally 97 cases(102 eyes)were randomly divided into 3 groups according to the type of IOL. Group A were implanted photochromic IOL, group B were implanted blue-light filtering IOL, group C were implanted conventional clear IOL. The contrast vision was evaluated in photopic condition three months after operation.

RESULTS: In the scotopia condition, the contrast vision of the group A was lower than that in the photopic condition, but the contrast vision of the group A became statistically different until the contrast dropped to 10% contrast condition. The contrast vision of group B and group C were lower than that in the photopic condition and there had significant statistical difference. In the photopic condition: there was no significant statistical difference between group A and C in all the contrast level(P_100%=1, P_25%=1, P_10%=0.86); the contrast vision of the group A was higher than group B in all the contrast level(P_100%=0.010, P_25%=0.004, P_10%=0.041); In the 100%, 25% contrast condition, the contrast vision of the group B was lower than group C. Difference was statistically significant, but it became no statistically significant difference until the contrast dropped to 10% contrast condition(P_100%=0.014, P_25%=0.016, P_10%=0.457). In the scotopia condition: there was no statistical difference between group A and group C in 100%, 25% contrast level, but in the 10% contrast condition the contrast vision of the group A was higher than group C. Difference was statistically significant(P_100%=1, P_25%=0.111, P_10%=0.029). The contrast vision of the group A was higher than group B in all the contrast level. Difference was statistically significant(P_100%=0.000, P_25%=0.000, P_10%=0.001). The contrast vision of group B was lower than group C in the 100%, 25% contrast condition. Difference was statistically significant, but it became no statistically different until the contrast dropped to 10% contrast condition(P_100%=0.000, P_25%=0.039, P_10%=0.596).

CONCLUSION: To the senile cataract patients, the photochromic Matrix 400 has better visual quality in scotopia lighting condition than the blue-light filtering people.