Correlation between contrast sensitivity and higher-order aberration based on pupil diameter after cataract surgery

Area of Science:

• Ophthalmology
• Optical Engineering
• Vision Science

Background:

• Cataract surgery outcomes are influenced by intraocular lens (IOL) type.
• Understanding the relationship between optical aberrations and visual function is crucial for IOL selection.

Purpose of the Study:

• To investigate the correlation between contrast sensitivity and higher-order aberrations (HOAs) after cataract surgery.
• To compare visual performance with aspheric versus spherical IOLs.

Main Methods:

• A prospective study randomized 92 patients (120 eyes) to four IOL types: three aspheric and one spherical.
• Postoperative measurements included contrast sensitivity, HOAs (Zernike decomposition), and pupil diameter under photopic and mesopic conditions.
• Correlation analysis was performed between HOAs and contrast sensitivity.

Main Results:

• Aspheric IOLs demonstrated significantly better contrast sensitivity and area under the log contrast sensitivity function under mesopic conditions compared to spherical IOLs.
• Spherical aberration was significantly lower in aspheric IOL eyes under mesopic conditions.
• Coma aberration negatively correlated with photopic contrast sensitivity, while spherical aberration negatively correlated with mesopic contrast sensitivity.

Conclusions:

• Aspheric IOLs enhance visual function, particularly under mesopic conditions.
• Coma aberration significantly impacts visual function under photopic conditions.
• Spherical aberration is a key factor affecting visual function under mesopic conditions.