Corneal topographic analysis in patients with cataract

Area of Science:

• Ophthalmology
• Corneal Physiology
• Optometry

Background:

• Senile cataract affects the crystalline lens, but corneal health is crucial for visual acuity.
• Understanding preoperative corneal topography in cataract patients is essential for surgical planning and outcomes.
• Previous studies have not fully characterized the detailed corneal topography in senile cataract patients.

Purpose of the Study:

• To analyze the preoperative corneal topography in patients with senile cataract.
• To identify common corneal patterns and quantify their asymmetry and regularity.
• To determine if senile cataract correlates with specific corneal topographic abnormalities.

Main Methods:

• Corneal topography was assessed using the Topographic Modeling System (TMS) in 161 eyes of 101 patients (aged 50-80).
• Key metrics including Surface Asymmetry Index (SAI), Surface Regularity Index (SRI), Simulated Keratometry (Sim K), and Minimum K reading were analyzed.
• Corneal patterns were classified into round, oval, bow-tie (symmetric/asymmetric), and irregular.

Main Results:

• The mean SAI was 0.36 and SRI was 0.79.
• Irregular corneal patterns were most prevalent (40.4%), followed by bow-tie (22.2%), round (21.2%), and oval (16.1%).
• Statistically significant higher SAI and SRI values were observed in the irregular corneal pattern group compared to others (P < 0.01 and P < 0.05).

Conclusions:

• The cornea in eyes with senile cataract is not a perfect spherocylinder but is asymmetrically aspheric.
• Preoperative corneal topography in these patients is often irregular, with reduced peripheral curvature.
• These findings highlight the importance of detailed corneal assessment in senile cataract patients for optimizing surgical results.