Influence of Residual Astigmatism on Visual Acuity in Patients Undergoing Cataract Surgery With Trifocal Intraocular Lens Implantation

Influence of Residual Astigmatism on Visual Acuity in Patients Undergoing Cataract Surgery With Trifocal Intraocular Lens Implantation

MAIN OBJECTIVE: To assess the influence of residual astigmatism on visual acuity in the different lens foci in patients operated on for cataracts with a trifocal intraocular lens implant.

SECONDARY OBJECTIVE: To study the influence of residual astigmatism on the visual quality of the patient in the far focus and to determine if there are differences of affectation in the two study groups.

It will be studied how small residual astigmatisms after cataract surgery degrade the visual acuity of patients in the three focal planes of trifocal IOLs. Not only VA will be studied, but also visual quality through contrast sensitivity curves.

Inclusion Criteria:

• Bilateral surgery performed by the same surgeon
• IOLs implanted IOLs FineVision (MicroF) and FineVision Toric (PodFT)
• Patients with pre-surgery corneal astigmatism less than 2.5 D
• Patients whose pupillary diameter in physiological position (conditions of lower photopic pupil) not over 4 mm.

Exclusion Criteria:

• Post-surgical refractive residual astigmatisms ≧ 1.55D
• Previous corneal or intraocular surgeries
• Active diseases
• Eye complications during the 3-month follow-up