Inaccuracy of intraocular lens power prediction for cataract surgery in angle-closure glaucoma

Sung Yong Kang, Samin Hong, Jung Bin Won, Gong Je Seong, chanyun kim

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Purpose: To assess the accuracy of intraocular lens (IOL) power predictions for cataract surgery in eyes with primary angle-closure glaucoma (ACG). Because of shifting of the capsular bag apparatus and shortening of the axial length, preoperative calculation of IOL power may be inaccurate for eyes with ACG. Materials and Methods: This retrospective comparative case series comprised of 42 eyes from 42 patients with primary ACG and 45 eyes from 45 subjects with normal open-angles undergoing uneventful cataract surgery. Anterior segment biometry including anterior chamber depth, lens thickness, and axial length were compared. Using the SRK-II formula, the powers of the implanted IOL and the actual postoperative spherical equivalent (SE) refractive errors were compared between the two groups. Also, the absolute values of differences between predicted and residual SE refractive errors were also analyzed for each group. Results: In ACG patients, anterior chamber depth and axial length were shorter and the lens was thicker than normal controls (all p < 0.001). Even though residual SE refractive error was not significantly different (p = 0.290), the absolute value of the difference between predicted and residual SE refractive error was 0.64 ± 0.50 diopters in AGC patients and 0.39 ± 0.36 diopters in control subjects (p = 0.012). The number of eyes that resulted in inaccurate IOL power predictions of more than 0.5 diopters were 21 (50.00%) in the ACG group, but only 12 (26.67%) in the control group (p = 0.043). Conclusion: IOL power predictions for cataract surgery in ACG patients can be inaccurate, and it may be associated with their unique anterior segment anatomy.

Original languageEnglish
Pages (from-to)206-210
Number of pages5
JournalYonsei medical journal
Volume50
Issue number2
DOIs
Publication statusPublished - 2009 Jun 11

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Angle Closure Glaucoma
Intraocular Lenses
Cataract
Refractive Errors
Anterior Chamber
Lenses
Biometry
Anatomy
Control Groups

All Science Journal Classification (ASJC) codes

  • Medicine(all)

Cite this

Kang, Sung Yong ; Hong, Samin ; Won, Jung Bin ; Seong, Gong Je ; kim, chanyun. / Inaccuracy of intraocular lens power prediction for cataract surgery in angle-closure glaucoma. In: Yonsei medical journal. 2009 ; Vol. 50, No. 2. pp. 206-210.
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abstract = "Purpose: To assess the accuracy of intraocular lens (IOL) power predictions for cataract surgery in eyes with primary angle-closure glaucoma (ACG). Because of shifting of the capsular bag apparatus and shortening of the axial length, preoperative calculation of IOL power may be inaccurate for eyes with ACG. Materials and Methods: This retrospective comparative case series comprised of 42 eyes from 42 patients with primary ACG and 45 eyes from 45 subjects with normal open-angles undergoing uneventful cataract surgery. Anterior segment biometry including anterior chamber depth, lens thickness, and axial length were compared. Using the SRK-II formula, the powers of the implanted IOL and the actual postoperative spherical equivalent (SE) refractive errors were compared between the two groups. Also, the absolute values of differences between predicted and residual SE refractive errors were also analyzed for each group. Results: In ACG patients, anterior chamber depth and axial length were shorter and the lens was thicker than normal controls (all p < 0.001). Even though residual SE refractive error was not significantly different (p = 0.290), the absolute value of the difference between predicted and residual SE refractive error was 0.64 ± 0.50 diopters in AGC patients and 0.39 ± 0.36 diopters in control subjects (p = 0.012). The number of eyes that resulted in inaccurate IOL power predictions of more than 0.5 diopters were 21 (50.00{\%}) in the ACG group, but only 12 (26.67{\%}) in the control group (p = 0.043). Conclusion: IOL power predictions for cataract surgery in ACG patients can be inaccurate, and it may be associated with their unique anterior segment anatomy.",
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Inaccuracy of intraocular lens power prediction for cataract surgery in angle-closure glaucoma. / Kang, Sung Yong; Hong, Samin; Won, Jung Bin; Seong, Gong Je; kim, chanyun.

In: Yonsei medical journal, Vol. 50, No. 2, 11.06.2009, p. 206-210.

Research output: Contribution to journalArticle

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N2 - Purpose: To assess the accuracy of intraocular lens (IOL) power predictions for cataract surgery in eyes with primary angle-closure glaucoma (ACG). Because of shifting of the capsular bag apparatus and shortening of the axial length, preoperative calculation of IOL power may be inaccurate for eyes with ACG. Materials and Methods: This retrospective comparative case series comprised of 42 eyes from 42 patients with primary ACG and 45 eyes from 45 subjects with normal open-angles undergoing uneventful cataract surgery. Anterior segment biometry including anterior chamber depth, lens thickness, and axial length were compared. Using the SRK-II formula, the powers of the implanted IOL and the actual postoperative spherical equivalent (SE) refractive errors were compared between the two groups. Also, the absolute values of differences between predicted and residual SE refractive errors were also analyzed for each group. Results: In ACG patients, anterior chamber depth and axial length were shorter and the lens was thicker than normal controls (all p < 0.001). Even though residual SE refractive error was not significantly different (p = 0.290), the absolute value of the difference between predicted and residual SE refractive error was 0.64 ± 0.50 diopters in AGC patients and 0.39 ± 0.36 diopters in control subjects (p = 0.012). The number of eyes that resulted in inaccurate IOL power predictions of more than 0.5 diopters were 21 (50.00%) in the ACG group, but only 12 (26.67%) in the control group (p = 0.043). Conclusion: IOL power predictions for cataract surgery in ACG patients can be inaccurate, and it may be associated with their unique anterior segment anatomy.

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