Reversibility of Effects of Orthokeratology on Visual Acuity, Refractive Error, Corneal Topography, and Contrast Sensitivity
| Autor: | Teruo Nishida, Nobuhiko Chikamoto, Kiichi Ueda, Tai-ichiro Chikama, Ryoji Yanai, Yasuko Kobayashi |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Adult
Male medicine.medical_specialty Refractive error Visual acuity genetic structures Contact Lenses media_common.quotation_subject medicine.medical_treatment Visual Acuity Contrast Sensitivity Cornea Optics Ophthalmology Myopia medicine Orthokeratologic Procedures Humans Contrast (vision) Prospective Studies media_common medicine.diagnostic_test business.industry Orthokeratology Corneal Topography medicine.disease Corneal topography eye diseases Discontinuation Female sense organs medicine.symptom business Photopic vision |
| Zdroj: | Eye & Contact Lens: Science & Clinical Practice. 34:224-228 |
| ISSN: | 1542-2321 |
| DOI: | 10.1097/icl.0b013e318165d501 |
| Popis: | Objectives To investigate the changes in corneal shape and optical performance during and after discontinuation of overnight orthokeratology for correction of myopia. Methods Both eyes of 15 subjects were fitted with overnight reverse-geometry orthokeratology lenses, which were then worn for >4 hr overnight for 52 weeks. Subjects were free of ocular disease and had a corrected visual acuity of > or =1.0. Refractive correction, uncorrected visual acuity, corneal topography, and contrast sensitivity (at 4 spatial frequencies) were measured under photopic conditions. Results Refractive error (spherical equivalent) and contrast sensitivity were decreased, whereas uncorrected visual acuity, the surface asymmetry index, and the surface regularity index were increased, 1 week after the onset of overnight orthokeratology and remained so during the 52 weeks of treatment. These parameters had largely returned to baseline values by 8 weeks after treatment discontinuation. Conclusions Overnight orthokeratology improved uncorrected visual acuity and reduced refractive error but increased corneal irregularity and impaired contrast sensitivity. However, these changes in visual function and corneal shape were reversed after discontinuation of orthokeratology lens wear. |
| Databáze: | OpenAIRE |
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