Abstract:

Objective To evaluate the effects of cycloplegia on children’s biometric parameters measured by the optical biological measuring instrument Lenstar LS900. Methods A total of 30 children (58 eyes) were selected as subjects. Their age was between 5 and 13 and the mean age was 9.4. Sixteen of them were males (30 eyes) and 14 were females (28 eyes). The axial length (AL), central corneal depth (CCT), anterior chamber depth (ACD), corneal curvature (K1 and K2), white to white (WTW), lens thickness (LT), and pupil diameter (PD) before and after cycloplegia by compound tropicamide eye drops were measured by Lenstar LS900. Data were analyzed by t test and Pearson coefficient analysis. Results The AL, ACD, and CCT values before cycloplegia were (23.81±1.23) mm, (3.56±0.21) mm, and (539.62±24.88) μm and those after cycloplegia were (23.84±1.23) mm, (3.63±0.21) mm, and (550.55±24.77) μm. Results of statistical analysis showed that AL, ACD, CCT, and PD after cycloplegia were markedly larger than those before cycloplegia and differences were statistically significant (P<0.05). Changes of CCT before and after cycloplegia of males and females were (12.63±6.12) μm and (9.11±4.87) μm. Changes of CCT of males were markedly larger than those of females (t=2.42, P=0.02). Changes of K1, K2, LT, and WTW before and after cycloplegia were not significant. Conclusion Lenstar LS900 can be used to measure children's biometric parameters. Cycloplegia has certain effect on ACD, AL, and CCT. But more samples are needed for further evaluation.

Key words: Lenstar LS900, cycloplegia, biometry, children