Comparison of Pre-operative Measurements With Intraoperative Aberrometry in Predicting Correction for Low Toric Lens Correction in Cataract Surgery

Comparison of Pre-operative Measurements With Intraoperative Aberrometry in Predicting Needed Correction for Low Toric Lens Correction in Cataract Surgery

Examination of the accuracy of toric predictive power in patients with 1.5 diopters of astigmatism or less.

Based on preoperative keratometry and using the Baylor Nomogram and a standard factor for surgically-induced astigmatism, the investigators will calculate "keratometry-based total astigmatism" for each patient. This will be compared to "aberrometry-based total astigmatism", i.e. the total astigmatism measured by ORA in each case. With this information the investigators will determine in what portion of patients keratometry-based total astigmatism vs aberrometry-based total astigmatism predicts a need for astigmatism correction, (i.e., total astigmatism is greater than or equal to 0.5 D) during cataract surgery.

Inclusion Criteria:

• Patients who underwent conventional (non-femtosecond) cataract surgery and whose "data to be collected" are accessible and available from the ORA database.
• Patients whose medical records show they did not exhibit any significant ocular morbidity that would be expected to influence outcome measures.

Exclusion Criteria:

• Patients with visually significant co-morbidities (corneal, retina, optic nerve disease) that could affect their visual outcome or ability to be refracted after.
• Patients with surgical complications either during or after surgery (capsule tears, iris trauma, decentered IOL, cystoid macular edema, etc.)
• Patients with previous refractive surgery.