Femtosecond Laser Assisted Keratotomies for the Management of Corneal Astigmatism

Not Applicable

Completed

Brief Summary: A cataract is a clouding of the lens that occurs naturally with age. Cataract surgery involves removal of the cloudy lens and replacement with an artificial one. A special laser (femtosecond laser) is now being used to help make cataract surgery safer and more accurate . The femtosecond laser can also be used to correct astigmatism, an irregular curvature of the cornea, at the time of cataract surgery through a procedure called astigmatic keratotomy (AK). This study is gathering information about the specific laser settings that are used to perform astigmatic keratotomies (AK) during cataract surgery. This information will be used to improve the outcomes of patients that receive cataract surgery with astigmatic keratotomies in the future.

Recruitment & Eligibility

Inclusion Criteria

Age: ≥18 years of age
Sex: male or female
Patients who are planned to undergo femtosecond laser-assisted cataract surgery with astigmatic keratotomy at the Schein Ernst Mishra Eye clinic within the next 60 days of their cataract consultation visit. Subjects with planned single or bilateral cataract eye surgeries are eligible. Planned opposite eye surgery must be within 2-4 weeks of first cataract surgery.
Fluent in written and spoken English

Exclusion Criteria

Patients with corneal dystrophies, including anterior basement membrane dystrophy, keratoconus, and Fuch's endothelial corneal dystrophy.
Age < 18 years
Pregnant women
Cognitive impairment
Prisoners

Arm && Interventions

Group	Intervention	Description
Femto-AK Patients	Femto-AK	Femtosecond laser assisted cataract surgery with creation of astigmatic keratotomies for the correction of corneal astigmatism.

Primary Outcome Measures

Name	Time	Method
Keratometric Correction Index	1 month	Keratometric Correction index is the ratio of surgically induced astigmatism to target induced astigmatism. A correction index of 1 suggests that the actual surgically induced astigmatism, as measured by pre- vs- post-op reflectance keratometry, perfectly matched the target (anticipated) induced astigmatism. Correction indices below 1 suggest an under-correction while values above 1 suggest an over-correction.
Refractive Correction Index	1 month	Refractive Correction index is the ratio of surgically induced astigmatism to net effective astigmatism. A correction index of 1 suggests that the actual surgically induced astigmatism, as measured by pre- vs- post-op manifest refraction, perfectly matched the effective astigmatism as estimated by the nomogram. Correction indices below 1 suggest an under-correction while values above 1 suggest an over-correction.

Secondary Outcome Measures