Determination of Corneal Power after Refractive Surgery with Excimer Laser: A Concise Review

Area of Science:

• Ophthalmology
• Corneal Surgery
• Biomedical Optics

Background:

• Excimer laser refractive surgery is a common procedure worldwide.
• Patients with prior refractive surgery are now aging and require cataract surgery.
• Accurate intraocular lens (IOL) power calculation is essential for successful cataract surgery outcomes.

Purpose of the Study:

• To review the challenges in determining true corneal power in patients with prior refractive surgery.
• To discuss existing and novel methods for accurate corneal power assessment in this population.
• To highlight the importance of precise corneal power measurement for IOL selection.

Main Methods:

• Review of existing literature on refractive surgery and its impact on corneal power measurement.
• Analysis of sources of error in traditional methods for calculating corneal power.
• Evaluation of advanced techniques, including clinical history methods (Holladay) and corneal tomography.

Main Results:

• Refractive surgery alters the anterior corneal surface, complicating standard corneal power calculations.
• Traditional methods may introduce significant errors in IOL power estimation.
• Corneal tomography offers a more accurate assessment by measuring both anterior and posterior corneal curvatures.

Conclusions:

• Accurate corneal power determination is challenging but critical in post-refractive surgery patients undergoing cataract surgery.
• Corneal tomography represents a significant advancement in addressing these challenges.
• Improved methods for corneal power assessment will lead to better visual outcomes after IOL implantation.