Cataract Clinical Trial
Official title:
Comparison of Toric IOL Implantation and Opposite Clear Corneal Incision During Cataract Surgery to Correct Corneal Astigmatism
With increasing demands of patients concerning refractive outcome after cataract surgery,
toric intraocular lenses (IOLs) that correct corneal astigmatism have been introduced more
widely to cataract surgery. Originally toric IOLs were used mainly for patients with high
degrees of astigmatism, especially after corneal surgical procedures such as penetrating
keratoplasty. Since a couple of years, toric IOLs are available from numerous manufacturers
to correct lower amounts of astigmatism which are much more prevalent with about 30% having
a corneal astigmatism of 0.75D or more in the cataract population. This should result in
less spectacle dependence of patients due to the astigmatic correction.
The alternative method to reduce corneal astigmatism as part of cataract surgery is to make
incisions on the steeper axis of the cornea such as limbal relaxing incisions or an
additional clear corneal incision opposite (OCCI) to the main cataract opening. These
techniques are in use since more than 2 decades and are widely used in clinical routine. As
with toric IOLs, precise alignment of the cuts with the axis of astigmatism is essential.
The disadvantage of the incisional techniques is the variability of the effect between
patients since it depends on factors such as the extent of scaring of the cuts after surgery
as well as corneal thickness. The main advantage is the simplicity of the technique and the
lower cost.
Aim of this study is to compare toric IOL implantation and opposite clear corneal incision
during cataract surgery to correct corneal astigmatism.
n/a
Allocation: Randomized, Endpoint Classification: Efficacy Study, Intervention Model: Parallel Assignment, Masking: Double Blind (Subject, Investigator), Primary Purpose: Treatment
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