Correlations between Preoperative Angle Parameters and Postoperative Unpredicted Refractive Errors after Cataract...

Area of Science:

• Ophthalmology
• Medical Optics
• Glaucoma Research

Background:

• Accurate intraocular lens (IOL) power prediction is crucial for successful cataract surgery outcomes.
• Open-angle glaucoma (OAG) may influence ocular biometry and refractive predictability.
• Understanding factors affecting refractive outcomes in OAG patients is clinically significant.

Purpose of the Study:

• To evaluate the precision of IOL power calculations in patients with OAG undergoing cataract surgery.
• To identify specific preoperative anterior segment parameters that correlate with refractive surprises post-surgery in OAG patients.

Main Methods:

• A comparative study involving 45 eyes with OAG and 63 control eyes without glaucoma.
• Biometry (IOL-master) was used for predicted refractive error, compared with auto-refractometry measurements 2 months postoperatively.
• Swept-source optical coherence tomography (SS-OCT) assessed anterior angle parameters (AOD, TISA, ARA, TIA).

Main Results:

• OAG patients exhibited significant differences between predicted and actual postoperative refractive errors, tending towards myopia.
• No significant refractive prediction errors were observed in the control group.
• Preoperative angle parameters (AOD, ARA, TISA, TIA) in superior and inferior quadrants correlated significantly with refractive prediction errors in OAG eyes.

Conclusions:

• Unpredicted refractive errors are more prevalent after cataract surgery in individuals with OAG compared to non-glaucomatous individuals.
• Specific preoperative anterior chamber angle parameters, notably the superior angle open distance (AOD 500), are linked to postoperative refractive unpredictability in OAG.