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: A university tertiary referral hospital Design: A 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 following 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 one-way analysis of variance (ANOVA) was used to compare repeated measures across these conditions. Results: Upon evaluating the powers of the IOLs, no statistically significant differences were observed among the intact, one-half, and two-halves conditions (p = 0.77). The majority of post-hemidissection power measurements fell within the ISO tolerance range. On average, the differences in power before and after hemidissection were minimal, measuring approximately 0.15 ± 0.17 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 to 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.
Gu et al. (Mon,) studied this question.