Ocular aberrations and visual performance with an aspheric single-piece intraocular lens: contralateral comparative...

Area of Science:

• Ophthalmology
• Optics
• Biomedical Engineering

Background:

• Cataract surgery involves replacing the clouded natural lens with an artificial intraocular lens (IOL).
• The optical quality of IOLs, particularly their impact on higher-order aberrations, is crucial for visual function.
• Aspheric IOL designs aim to reduce spherical aberration and potentially improve visual outcomes compared to traditional spherical IOLs.

Purpose of the Study:

• To compare the optical performance of a single-piece aspheric Tecnis intraocular lens (IOL) with a spherical Sensar AR40e IOL.
• To evaluate the influence of these IOLs on ocular higher-order aberrations, specifically spherical aberration, coma, and trefoil.
• To assess the impact on photopic and mesopic contrast sensitivity following cataract surgery.

Main Methods:

• A randomized prospective contralateral comparative study involving 28 patients with bilateral senile cataract.
• Exclusion of eyes with conditions other than cataract that could affect visual function.
• Comparison of aspheric IOLs against spherical IOLs using corrected distance visual acuity (CDVA), wavefront aberrometry, and contrast visual acuity measurements.

Main Results:

• No significant difference in CDVA between the aspheric and spherical IOL groups.
• Significantly lower ocular spherical aberration was observed with the aspheric IOL (P<.001).
• The aspheric IOL group demonstrated superior photopic and mesopic contrast sensitivity at all tested spatial frequencies.

Conclusions:

• Single-piece aspheric IOLs significantly reduce ocular spherical aberration after cataract surgery.
• Aspheric IOLs lead to enhanced mesopic contrast sensitivity compared to spherical IOLs.
• The absence of significant differences in coma and trefoil suggests adequate IOL centration in both groups.