[Application of Icare rebound tonometer in children after congenital cataract surgery].

OBJECTIVE

To compare the difference in intraocular pressure (IOP) readings as well as the tolerability between Icare rebound tonometer (Icare RBT) and Goldmann applanation tonometer (GAT), and to evaluate the application of Icare RBT in monitoring the intraocular pressure in children after congenital cataract surgery.

METHODS

The IOP was measured with the Icare RBT and GAT respectively in 150 children (262 eyes) after congenital cataract surgery by two experienced ophthalmologists. Correlation and Bland-Altman analysis were used to assess the agreement in IOP readings between the two instruments. The influence of the central corneal thickness (CCT) adjusted for age on IOP readings was analyzed by linear regression analysis. The tolerance of the patients to Icare RBT and GAT measurement were surveyed.

RESULTS

The mean age was (44.82 ± 11.56) months in 150 children, including 81 boys and 69 girls. The mean IOP readings by the Icare RBT and GAT were (16.08 ± 5.72) mmHg and (14.17 ± 5.05) mmHg, respectively. The mean difference between the Icare RBT and GAT was (1.91 ± 2.04) mmHg, which was significantly correlated with CCT (r=0.409, P<0.001). The IOP readings by Icare RBT was significantly correlated with that measured by GAT(r= 0.936, P<0.001). The 95% confidence interval of the difference between the two instruments was ?2.10 to 5.91 mmHg. The Icare RBT examination was well tolerated by the children compared to the GAT examination.

CONCLUSION

The Icare RBT is easy to use and well tolerated by the children after congenital cataract surgery. Compared to GAT, the value measured by the IOPs trends to be overestimated. The difference in readings between the 2 tonometers will magnify with the increase in CCT.