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Published on: September 20, 2024
Residual refractive error and visual outcome after cataract surgery using spherical versus Aspheric IOLs
1Department of Ophthalmology, Dongguk University Ilsan Hospital, 814, Siksadong, Ilsan-dong-gu, Koyang, Kyunggido 410-773, South Korea. cpark@duih.org
Summary
Cataract surgery with aspheric intraocular lenses (IOLs) offers better uncorrected distance visual acuity (UCVA) than spherical IOLs, especially with greater residual astigmatism. Aspheric IOLs provide superior UCVA outcomes in these cases.
Area of Science:
- Ophthalmology
- Refractive Surgery
- Biomedical Engineering
Background:
- Cataract surgery aims to restore vision by replacing the clouded natural lens with an artificial intraocular lens (IOL).
- The choice between spherical and aspheric IOLs can influence postoperative visual outcomes, particularly uncorrected distance visual acuity (UCVA).
- Residual refractive error, such as astigmatism, can impact visual quality after surgery.
Purpose of the Study:
- To compare the effect of residual refractive error on UCVA after cataract surgery using spherical versus aspheric IOLs.
- To analyze the correlation between various postoperative optical parameters and UCVA in both IOL groups.
Main Methods:
- 160 eyes from 125 patients undergoing cataract surgery were analyzed, with 80 eyes receiving spherical IOLs and 80 receiving aspheric IOLs.
- Postoperative UCVA, manifest refraction, pupil size, and spherical aberration were measured.
- Eyes with over 2.0 diopters of postoperative astigmatism were excluded.
Main Results:
- In the spherical IOL group, UCVA correlated significantly with age, residual astigmatism, and the absolute value of spherical equivalent (SE).
- In the aspheric IOL group, UCVA correlated significantly only with the absolute value of SE.
- Aspheric IOLs demonstrated better UCVA performance when residual astigmatism was 1.5 diopters or greater.
Conclusions:
- Spherical IOLs provide good UCVA with minimal residual astigmatism.
- Aspheric IOLs offer superior UCVA, particularly in cases with moderate to high residual astigmatism (≥1.5 diopters).
- The selection of IOL type should consider the expected or actual residual astigmatism for optimal visual outcomes.
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