Journal of cataract and refractive surgery · 2026
Accuracy of measuring the diopter power of intraocular lenses after hemidissection.
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Gu Siyi, Yan Weijia, Khoramnia Ramin, Auffarth Gerd U, Łabuz Grzegorz
Аннотация
PURPOSE: To assess whether the power of intraocular lenses (IOLs) can still be accurately measured after hemidissection, by comparing the measurements of intact lenses with those of the hemidissected lenses.
SETTING: University tertiary referral hospital.
DESIGN: Laboratory study.
METHODS: Monofocal (n = 8), extended depth-of-focus (EDOF) (n = 2), and trifocal IOLs (n = 2) from leading manufacturers were evaluated. The power of each IOL was assessed in the intact state and after hemidissection under room temperature conditions. Subsequently, optical evaluation was performed with a single half (the larger part) placed in a model eye, and then with both halves reassembled, aligning the adjacent edges along the hemidissection line. A 1-way analysis of variance was used to compare repeated measures across these conditions.
RESULTS: On evaluating the powers of the IOLs, no statistically significant differences were observed among the intact, one-half, and two-halves conditions ( P = .77). Most of the post-hemidissection power measurements fell within the ±0.4D tolerance range. On average, the differences in power before and after hemidissection were minimal, measuring approximately 0.15 ± 0.17 diopters (D) for monofocal, 0.10 ± 0.07 D for EDOF, and 0.02 ± 0.01 D for trifocal IOLs.
CONCLUSIONS: The power of a hemidissected IOL can be accurately assessed. Measuring one-half of a hemidissected IOL provides results that are comparable with those from evaluating both halves, thus accurately reflecting the power of the intact ones. This study suggests that confirming a deviation in power of an explanted lens is a viable option despite the physical damage caused by explantation procedures.
SETTING: University tertiary referral hospital.
DESIGN: Laboratory study.
METHODS: Monofocal (n = 8), extended depth-of-focus (EDOF) (n = 2), and trifocal IOLs (n = 2) from leading manufacturers were evaluated. The power of each IOL was assessed in the intact state and after hemidissection under room temperature conditions. Subsequently, optical evaluation was performed with a single half (the larger part) placed in a model eye, and then with both halves reassembled, aligning the adjacent edges along the hemidissection line. A 1-way analysis of variance was used to compare repeated measures across these conditions.
RESULTS: On evaluating the powers of the IOLs, no statistically significant differences were observed among the intact, one-half, and two-halves conditions ( P = .77). Most of the post-hemidissection power measurements fell within the ±0.4D tolerance range. On average, the differences in power before and after hemidissection were minimal, measuring approximately 0.15 ± 0.17 diopters (D) for monofocal, 0.10 ± 0.07 D for EDOF, and 0.02 ± 0.01 D for trifocal IOLs.
CONCLUSIONS: The power of a hemidissected IOL can be accurately assessed. Measuring one-half of a hemidissected IOL provides results that are comparable with those from evaluating both halves, thus accurately reflecting the power of the intact ones. This study suggests that confirming a deviation in power of an explanted lens is a viable option despite the physical damage caused by explantation procedures.