A Prototype Erodible Mask Delivery System for the Excimer Laser

Maloney, Robert K.; Friedman, Marc D.; Harmon, Troy; Hayward, Mike; Hagen, Kerry; Gailitis, Raymond P.; Waring, George O.

doi:10.1016/s0161-6420(93)31609-x

Cited by 44 publications

(2 citation statements)

References 8 publications

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“…The first reports on photorefractive keratectomy of hyperopia were published in 1992-1993 (Dausch et al 1993, Goes 1992, Maloney et al 1993). Since then, few studies have been published about the use of this technique.…”

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Excimer laser treatment of hyperopia

Füst

Németh

Süveges

et al. 1998

Acta Ophthalmologica Scandinavica

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ABSTRACT.Purpose: The aim of this study was to analyse the clinical results of hyperopic photorefractive keratectomy treatments and to compare the results achieved with the usage of different masks. Method: 20 eyes of 16 hyperopic patients were treated, using the AesculapMeditec MEL60 193nm ArF excimer laser. The mean duration of follow-up was 9.9∫3.4 months. Statistical comparison of the results with the two masks was made using the unpaired Student t-test. Results: Preoperative mean spherical equivalent was π4.23∫1.18D, which changed to π0.20∫0.78D at one month and regressed to π1.23∫1.27D at the last control examination. After 6 months 60% (12 eyes) had spherical equivalent within ∫1.0D of the attempted correction. The statistical analysis showed no significant difference between the results with the two masks. Conclusion: Good preparation for the treatment is of equal importance for the results of the photorefractive keratectomy as compared to the technical circumstances.Key words: refractive surgery -excimer laser -hyperopia -regression. Acta Ophthalmol. Scand. 1998: 76: 686-691 Copyright C Acta Ophthalmol Scand 1998. ISSN 1395-3907 S ince the end of the 19 th century, trials have been performed to correct refractive errors by surgical methods. The majority of the successful methods were designed to flatten the corneal surface, and thus to correct myopia. However, the treatment of hyperopia by refractive surgery has proved to be more challenging. Many trials for steepening the central corneal surface, necessary for correction of hyperopia, have not progressed beyond the stage of experiments on animal eyes (Sabry et al. 1991;Trembly & Keetes 1991;Lee et al. 1992;Vrabec et al. 1993). The results of methods which have been used clinically usually show relatively poor predictability and stability. After 1 year the preoperative refraction decreased on average by 55% with thermal keratoplasty by needle (Charpentier et al. 1995), by about 50% with thermal keratoplasty by holmium-YAG laser (Durrie et al. 1994;Koch et al. 1996), and by 67% with hexagonal keratotomy (Neumann & McCarty 1988).The use of the excimer laser for corneal surgical purposes began at the end of the 1980s (Stark et al. 1992). The first reports on photorefractive keratectomy of hyperopia were published in 1992(Dausch et al. 1993, Goes 1992, Maloney et al. 1993). Since then, few studies have been published about the use of this technique. In the present prospective study we analyse the clinical results of our hyperopic photorefractive keratectomy (PRK) treatments, and compare the results achieved with the usage of two different masks. We also report our experience using a more reliable measured parameter as a marker for the results obtained. We consider this to be a preliminary report. Material and MethodsPatients and preoperative examination: 20 eyes of 16 hyperopic patients (age 21-51 years, mean preop. spherical equivalent: π4.23∫1.18 D) were treated with spherical PRK in 1994. These patients had no other ocular conditions, and the cyclo...

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confidence: 99%

“…The use of the excimer laser for corneal surgical purposes began at the end of the 1980s (Stark et al 1992). The first reports on photorefractive keratectomy of hyperopia were published in 1992-1993 (Dausch et al 1993, Goes 1992, Maloney et al 1993). Since then, few studies have been published about the use of this technique.…”

mentioning

confidence: 99%

Excimer laser treatment of hyperopia

Füst

Németh

Süveges

et al. 1998

Acta Ophthalmologica Scandinavica

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Visual Performance After Photorefractive Keratectomy

Verdon¹

1996

Arch Ophthalmol

136

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Lasers in ophthalmology

Krauss

Puliafito

1995

Lasers Surg Med

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This article reviews the principle uses of ophthalmic lasers, providing historical background with an emphasis on new applications and areas of investigation. Ophthalmic photocoagulation was the first medical laser application and has restored or maintained vision in millions of people. More recently, photodisruption and, increasingly, ablation have gained prominence for treating a wide range of ocular pathology. The unique properties of lasers have also been harnessed for diagnostic purposes, with optical coherence tomography representing a significant improvement over existing imaging methods. Many ophthalmic applications of lasers have been developed, but the field is a dynamic one which continues to evolve along with laser technology itself.

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A Prototype Erodible Mask Delivery System for the Excimer Laser

Cited by 44 publications

References 8 publications

Excimer laser treatment of hyperopia

Excimer laser treatment of hyperopia

Visual Performance After Photorefractive Keratectomy

Lasers in ophthalmology

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