Excimer laser photorefractive keratectomy for hyperopia

Dausch, D; Smecka, Z; Klein, Robert J.; Schröder, Eckhard; Kirchner, Stephan

doi:10.1016/s0886-3350(97)80338-0

Cited by 69 publications

(31 citation statements)

References 7 publications

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“…The greatest accepted subjective refraction -the manifest hyperopia -and not the cycloplegic refraction, was taken as the basis for the excimer laser treatment. This was because our experience, and also that of others (Dausch et al 1997) has shown that adult hyperopic patients tolerate manifest refraction better than cycloplegic. For testing the near vision we used the 13-scalecharts of Csapody (see Table 1).…”

supporting

confidence: 57%

“…In this new mask the treatment zone is enlarged to 9.0 mm -this includes also a transition zone, and the diameter of the corrected zone is 6.0 mm. With this mask Dausch et al (1997) have reported that 81% of treated eyes were within ∫1.0 D after 12 months and high regression was found only in one case. However, a direct comparison between the 7.0 mm and 9.0 mm treatment zone masks was not performed.…”

Section: Discussionmentioning

confidence: 79%

“…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%

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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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supporting

confidence: 57%

Section: Discussionmentioning

confidence: 79%

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Excimer laser treatment of hyperopia

Füst

Németh

Süveges

et al. 1998

Acta Ophthalmologica Scandinavica

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“…Several methods such as hexagonal keratectomy, radial and diode thermokeratoplasty, contact and non-contact Ho:YAG, conductive keratoplasty, automatic lamellar keratoplasty, clear lense extraction, intrastromal corneal implants were tried in treatment of hypermetropia. But low predictability, refractive stability and high complication rate were reported from these methods [4][5][6]. 193_nm excimer laser is used successfully in treatment of myopia and astigmatism [7,8].…”

Section: Discussionmentioning

confidence: 99%

“…PRK is used as a safe, efficient and predictable method in correction of myopia and astigmatism as well as treatment of hyperopia. However, post-operative pain, corneal haze formation, high regression rate and late stabilization of visual acuity in patients with high grade hyperopia (>+6.00) are the disadvantages of this method [3,4].…”

Section: Introductionmentioning

confidence: 99%