[Surgical correction of astigmatism using kerato-resection methods]

Area of Science:

• Ophthalmology
• Surgical Techniques
• Corneal Refractive Surgery

Background:

• Hypermetropic and mixed astigmatism present challenges in visual correction.
• Existing surgical methods for astigmatism correction require evaluation for efficacy.

Purpose of the Study:

• To compare the effectiveness of two surgical techniques for correcting hypermetropic and mixed astigmatism.
• To evaluate clinoid resection and clinoid resection with tangent autoclinoplasty.

Main Methods:

• Surgical techniques were refined through experiments on isolated eyes and rabbit models.
• Clinical study involved 34 patients with corneal astigmatism (2.0 to 6.25 diopters).
• Two groups: 17 patients underwent classical clinoid resection, 17 had clinoid resection with tangent autoclinoplasty.

Main Results:

• Corneal healing (cicatrization) was observed by the third month post-surgery in rabbit models.
• Mean astigmatism reduction was 2.47 diopters with classical clinoid resection.
• Mean astigmatism reduction was 4.8 diopters with clinoid resection and tangent autoclinoplasty.

Conclusions:

• Both surgical methods effectively reduce corneal astigmatism.
• Tangent autoclinoplasty offers a more significant reduction in astigmatism compared to classical clinoid resection.
• These techniques provide viable surgical options for correcting moderate to high astigmatism.