Influence of Pilocarpine Eyedrops on the Ocular Biometric Parameters and Intraocular Lens Power Calculation

Ruxin Gao; Jinkun Liu; Xiaojie Zhou; Luping Huang; Weiyi Huang; Yingying Xue; Fei Wang; Songjian Gong; Renyi Wu; Yuhong Wang

doi:10.1155/2023/7680659

Influence of Pilocarpine Eyedrops on the Ocular Biometric Parameters and Intraocular Lens Power Calculation

J Ophthalmol. 2023 Jul 7:2023:7680659. doi: 10.1155/2023/7680659. eCollection 2023.

Authors

Ruxin Gao^{1

2}, Jinkun Liu^{1

2}, Xiaojie Zhou^{1

2}, Luping Huang^{1

2}, Weiyi Huang^{1

2}, Yingying Xue^{1

2}, Fei Wang^{1

2}, Songjian Gong^{1

2}, Renyi Wu^{1

2}, Yuhong Wang^{1

2}

Affiliations

¹ Department of Ophthalmology, Eye Institute & Affiliated Xiamen Eye Center, School of Medicine, Xiamen University, Xiamen 361001, China.
² Department of Ophthalmology, Fujian Provincial Key Laboratory of Corneal & Ocular Surface Diseases, Xiamen 361001, China.

Abstract

Objective: To evaluate the influence of pilocarpine eyedrops on the ocular biometric parameters and whether these parameter changes affect the intraocular lens (IOL) power calculation in patients with primary angle-closure glaucoma (PACG).

Methods: Twenty-two PACG patients and fifteen normal subjects were enrolled. Ocular biometric parameters including the axial length (AL), anterior chamber depth (ACD), lens thickness (LT), mean keratometry (Km), and white-to-white distance (WTW) were measured by using a Lenstar LS 900 device before and at least 30 minutes after instillation of 2% pilocarpine eyedrops. Lens position (LP) was calculated, and the IOL power prediction based on the ocular biometric parameters was performed using the Barrett Universal II, Haigis, Hoffer Q, Holladay I, or SRK/T formulas before and after pilocarpine application.

Results: In both PACG and normal groups, pilocarpine eyedrops induced a slight but statistically significant increase in the mean AL (0.01 mm for both groups) and mean LT (0.02 mm and 0.03 mm, respectively) but a significant decrease in the mean ACD (0.03 mm and 0.05 mm, respectively) and mean LP (0.02 mm and 0.04 mm, respectively). No significant changes in the mean Km and WTW were noticed in both groups. In addition, the IOL power calculation revealed insignificant changes before and after the pilocarpine instillation in both groups, regardless of the formula used.

Conclusions: Pilocarpine eyedrops can induce slight changes in the ocular biometric parameters including the AL, ACD, LT, and LP. However, these parameter changes will not result in a significant difference in IOL power estimation.