[Intraocular lens (IOL) power calculation after keratorefractive procedures]

Area of Science:

• Ophthalmology
• Refractive Surgery
• Cataract Surgery

Context:

• Corneal refractive surgery significantly alters corneal power.
• Standard IOL calculation methods may be inaccurate post-refractive surgery.
• Accurate IOL power is critical for visual outcomes in cataract surgery.

Purpose:

• To compare methods for estimating corneal power for IOL calculation after corneal refractive surgery.
• To identify optimal approaches for ensuring accurate IOL power in this patient population.

Summary:

• A literature review indicates that accurate IOL power calculations necessitate specific keratometry (K) data.
• Third-generation formulas require both pre- (Kpre) and post-treatment keratometry (Kpost) records.
• Fourth-generation formulas require only post-treatment keratometry (Kpost) records.

Impact:

• Recommends registering pre-treatment refraction and keratometry (K) before refractive procedures.
• Suggests using third-generation formulas with Aramberri's double-K correction or fourth-generation formulas for improved accuracy.
• Aims to enhance refractive predictability and patient satisfaction in cataract surgery following refractive procedures.