[Accommodation perimeters after phakic posterior chamber implantable contact lens implantation]

To evaluate the change of accommodation function after phakic posterior chamber implantable contact lens (PPC-ICL) implantation for high myopic eyes.

It was a retrospective case series study. PPC-ICL implantation surgery was performed in 36 eyes of 18 high myopic patients. Uncorrected visual acuity, best-corrected visual accuracy, amplitude of accommodation, pupil distance were tested and AC/A was calculated before, one month and three months after operation. Rank-sum test and variance analysis test was performed for statistic study.

Before surgery, long-distance best corrected visual acuity was 0.55 (0.20, 1.50) for left eyes and 0.60 (0.10, 1.20) for right eyes. One and six months after surgery, it was 0.80 (0.40, 1.20), 0.85 (0.50, 1.50) for left eyes and 1.00 (0.30, 1.50), 0.95 (0.30, 1.50) for right eyes, all were improved. The difference between left and right eyes was statistically significant (W value 6.36, 6.18, P < 0.05). One and six months after surgery, uncorrected close-distance visual acuity was 1.00 (1.00, 4.00), 1.00 (1.00, 3.00) for left eyes and 1.00 (1.00, 4.00), 1.00 (1.00, 4.00) for right eyes. The difference for both eyes was not statistically significant compared with preoperative(W value 1.61, 2.72, P > 0.05). At one and six months after surgery, amplitude of accommodation was (8.28 ± 2.12) D, (8.28 ± 2.16) D for left eyes and (8.58 ± 1.98) D, (8.49 ± 2.10) D for right eyes, much better than the result (6.78 ± 1.96) D and (6.69 ± 2.14) D before surgery. The difference was statistically significant (F = 4.36, P < 0.05 and F = 4.04, P < 0.05). At one and six months after surgery, near and distant AC/A ratio were (3.96 ± 1.37) , (4.22 ± 1.33) , (4.78 ± 1.06) and (5.04 ± 1.01) , higher than (4.87 ± 0.97) and (5.23 ± 0.92) before surgery. The difference of near and distant AC/A ratio was statistically significant (F = 3.31, P < 0.05 and F = 4.10, P < 0.05). At one month and six months after surgery, near and distant pupil distance was (58.72 ± 2.78) mm, (61.56 ± 2.50) mm, (58.56 ± 2.4) mm and (61.61 ± 2.52) mm, smaller than that of (59.78 ± 2.39) mm and (62.44 ± 2.48) mm before surgery, but the difference was not statistically significant (F = 1.28, P > 0.05 and F = 0.76, P > 0.05).

Accommodation parameters after PPC-ICL implantation are improved obviously compared with those before surgery.