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1994•Journal of Refractive SurgeryRequires access

Measurement of Corneal Thickness by Ultrasound After Photorefractive Keratectomy in High Myopia

Lelio Sabetti, Liopoldo Spadea, N. Furcese, Emillo Balestrazzi

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Abstract

BACKGROUND: Photorefractive keratectomy (PRK) has been used to treat myopia in human eyes since 1988. METHODS: We evaluated corneal ablation depth after excimer laser myopic photorefractive keratectomy with the Summit Technology ExciMed UV200LA laser. Preoperative refraction was: mean 9.58 diopters (D) +/- 2.01, (range 6 to 17). We used ultrasound pachometry (1640 m/sec) in 40 eyes of 33 patients. Mean follow-up was of 49.5 weeks (range 16 to 76). RESULTS: The measurement of the corneal thickness showed a reduction of the initial thickness followed by an inconsistent increase caused by wound healing and tissue proliferation. CONCLUSION: The data showed no direct correlation between diopters of refractive correction and the change in corneal thickness.

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What this paper is about

BACKGROUND: Photorefractive keratectomy (PRK) has been used to treat myopia in human eyes since 1988. METHODS: We evaluated corneal ablation depth after excimer laser myopic photorefractive keratectomy with the Summit Technology ExciMed UV200LA laser. Preoperative refraction was: mean 9.58 diopters (D) +/- 2.01, (range 6 to 17). We used ultrasound pachometry (1640 m/sec) in 40 eyes of 33 patients. Mean follow-up was of 49.5 weeks (range 16 to 76). RESULTS: The measurement of the corneal thickness showed a reduction of the initial thickness followed by an inconsistent increase caused by wound healing and tissue proliferation. CONCLUSION: The data showed no direct correlation between diopters of refractive correction and the change in corneal thickness.

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Available abstract

BACKGROUND: Photorefractive keratectomy (PRK) has been used to treat myopia in human eyes since 1988. METHODS: We evaluated corneal ablation depth after excimer laser myopic photorefractive keratectomy with the Summit Technology ExciMed UV200LA laser. Preoperative refraction was: mean 9.58 diopters (D) +/- 2.01, (range 6 to 17). We used ultrasound pachometry (1640 m/sec) in 40 eyes of 33 patients. Mean follow-up was of 49.5 weeks (range 16 to 76). RESULTS: The measurement of the corneal thickness showed a reduction of the initial thickness followed by an inconsistent increase caused by wound healing and tissue proliferation. CONCLUSION: The data showed no direct correlation between diopters of refractive correction and the change in corneal thickness.

Key concepts: Photorefractive keratectomy, Dioptre, Refractive error, Ophthalmology, Medicine, Ablation, Excimer, Cornea

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Measurement of Corneal Thickness by Ultrasound After Photorefractive Keratectomy in High Myopia — Research Paper | ScholarLens