Comparison of intraocular lens power calculation results before and after glaucoma surgery

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Abstract

Aim — to compare intraocular lens (IOL) power calculation before and after different types glaucoma procedures.

Material and methods. Into the study, 115 patients were included, divided into 3 groups: group 1 — patients, in whom sinustrabeculectomy was performed (n = 86); group 2 — patients with implanted Ex-PRESS shunt (n = 19), group 3 — patients after Ahmed glaucoma valve implantation (n = 10). For each patient before surgery optical biometry (IOL-Master 500) was performed and IOL power calculation using Barrett Universal II Formula (target refraction — emmetropia). Baseline data were compared with corresponding examinations results obtained in 6 months after glaucoma procedure, to evaluate its effect on main biometric parameters of the eye and the IOL calculation accuracy.

Results. Despite significant changes of optical and anatomic indices, mean values of target refraction before and after glaucoma surgery did not differ significantly: 0.00 ± 0.03 versus 0.03 ± 0.52 D (p = 0.628), 0.00 ± 0.1 versus 0.19 ± 0.61 D (p = 0.173), –0.04 ± 0.08 versus 0.11 ± 0.42 D (p = 0.269) for groups, respectively. However, there was a pronounced trend to the increase of target refraction data scattering.

Conclusion. Glaucoma procedures cause changes of biometrical parameters of the eye, which leads to decrease in accuracy of IOL calculation. Consequently, when choosing intraocular lens, it is recommended to use measurement results obtained after glaucoma surgery.

Keywords: intraocular lens; IOL power calculation; glaucoma; sinustrabeculectomy; Ex-PRESS shunt; Ahmed glaucoma valve; biometry; phacoemulsification; axial length; anterior chamber depth; keratometry.

About the authors

Dmitrii Fedorovich Belov

City Multifield Hospital No. 2

Author for correspondence.
Email: belovd1990@gmail.com
ORCID iD: 0000-0003-0776-4065
SPIN-code: 2380-2273

ophtalmologist, City Multifield Hospital No. 2

Russian Federation, St. Petersburg

Vadim Petrovich Nikolaenko

City Multifield Hospital No. 2; Saint Petersburg State University

Email: dr.Nikolaenko@mail.ru
ORCID iD: 0000-0002-6393-1289
SPIN-code: 4906-2542

MD, PhD, Doc. Sci. (Med.), Head of Ophthalmology Department, City Multifield Hospital No. 2, professor Otorhinolaryngology and ophthalmologydepartment of the Medical Faculty of St. Petersburg State University

Russian Federation, St. Petersburg; St. Petersburg

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Supplementary files

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2. Fig. 1. Distribution of target refraction before and after sinustrabeculectomy

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3. Fig. 2. Distribution of target refraction before and after Ex-PRESS shunt implantation

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4. Fig. 3. Distribution of target refraction before and after Ahmed valve implantation

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Copyright (c) 2020 Belov D.F., Nikolaenko V.P.

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