Excimer Laser Lamellar Keratoplasty of Augmented Thickness for Keratoconus

Journal of Refractive Surgery - Tập 14 Số 5 - Trang 517-525 - 1998
Lucio Buratto1, Sergio Belloni, Renato Valeri
1Centro Ambrosiano di Microchirugia Oculare, Milan, Italy. [email protected]

Tóm tắt

ABSTRACT PURPOSE: We describe a modified surgical technique for the treatment of patients in the early stage of keratoconus, when it is still possible to correct the astigmatic ametropia with contact lenses. METHODS: Excimer laser lamellar keratoplasty of augmented thickness (ELLKAT) is a procedure in which a deep piano excimer laser ablation is done on the host cornea and a donor lamellar buttonwith or without an excimer laser refractive ablation on the posterior surface- is sutured into the recipient bed. In 12 of 20 eyes, the homoplastic button, which had parallel faces and was devoid of any dioptric power, was treated refractively on its stromal face with a Chiron Keracor 116 excimer laser to correct the axial and/or induced myopia present due to the weakened cornea. RESULTS: The 8 eyes that received donor buttons without excimer laser ablation had improved spectacle-corrected visual acuity from a mean preoperative value of 20/100 (no eye saw 20/40 or better before surgery) to a mean postoperative value of 20/30 after 18 months. Mean refractive astigmatism was reduced from 4.84 ± 2.34 D to 1.00 1 0.46 D. Mean keratometric power was reduced from 56.75 ± 8.01 D to 44.21 ± 2.12 D. The associated mean spherical equivalent refraction was reduced from -4.75 to -3.00 D. Mean corneal thickness increased from 422.25 ± 83 µm preoperatively to 562.87 ± 57.81 µm postoperatively. The 12 eyes that received donor lamellar buttons treated with excimer laser also had improved spectacle-corrected visual acuity from a mean preoperative value of 20/100 to a mean postoperative value of 20/30 after 18 months. Astigmatism was reduced from a mean 4.84 ± 2.77 D to 1.66 ± 1.30 D; mean keratometric power was reduced from 56.08 ± 7.00 D to 45.31 ± 2.08 D; and the associated mean spherical equivalent refraction was reduced from -8.75 to -1.75 D. Corneal thickness increased from a mean 414.25 ± 64.75 µm preoperatively to 576.75 ± 28.23 µm postoperatively. CONCLUSION: Compared to penetrating keratoplasty, excimer laser lamellar keratoplasty of augmented thickness for keratoconus has the advantage of preserving the host endothelium and of reducing the refractive error in keratoconus. [J Refract Surg 1998;14:517-525]

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Tài liệu tham khảo

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Thông tin xuất bản

Journal of Refractive Surgery

Tập 14 Số 5

517-525

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