Refractive Change Induced by 2.8-mm Corneal Incision

Study of Refractive Change Induced by 2.8-mm Corneal Incisions for Cataract Surgery

The investigators' purpose is to study the induced refractive change caused by different 2.8-mm corneal incision locations in phacoemulsification, because the investigators hypothesize that the effect may be different for nasal, temporal, and superior location, although they are considered astigmatism neutral.

Patients will be randomized to nasal or temporal incision, or assigned to superior incision, depending on preexisting astigmatism. Visual acuity, refraction, keratometry, Pentacam analysis, intraocular pressure, biomicroscopy, and funduscopy, will be carried out before and after phacoemulsification.

Outcome measures will be induced corneal refractive change (Fourier power vector analysis), ISV change, and visual acuity, at 6 months.

Inclusion Criteria:

• Visual impairment for daily tasks caused by cataract
• Age older than 50 years
• Steep axis of corneal astigmatism at 90° ± 20° or 180° ± 20°
• Ability to cooperate in the protocol procedures

Exclusion Criteria:

• Age below 50
• Inability to cooperate with measurements