The Topographical Effect of Optical Zone Diameter in Orthokeratology Contact Lenses in High Myopes
Purpose. To evaluate the effect of the optical zone diameter (OZ) in orthokeratology contact lenses regarding the topographical profile in patients with high myopia (−4.00 D to −7.00 D) and to study its effect over the visual quality. Materials and Methods. Twelve patients (18 eyes) were fitted with...
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| Format: | Article |
| Language: | English |
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Wiley
2019-01-01
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| Series: | Journal of Ophthalmology |
| Online Access: | http://dx.doi.org/10.1155/2019/1082472 |
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| author | G. Carracedo T. M. Espinosa-Vidal I. Martínez-Alberquilla L. Batres |
| author_facet | G. Carracedo T. M. Espinosa-Vidal I. Martínez-Alberquilla L. Batres |
| author_sort | G. Carracedo |
| collection | DOAJ |
| description | Purpose. To evaluate the effect of the optical zone diameter (OZ) in orthokeratology contact lenses regarding the topographical profile in patients with high myopia (−4.00 D to −7.00 D) and to study its effect over the visual quality. Materials and Methods. Twelve patients (18 eyes) were fitted with overnight orthokeratology (OrthoK) with a randomized 6 mm or 5 mm OZ lens worn for 2 weeks, followed by a 2-week washout period, between both designs. Keratometry (K) readings, optical zone treatment diameter (OZT), peripheral ring width (PRW), higher-order aberrations (HOA), high (HC) and low contrast (LC) visual acuity, and subjective vision and comfort were measured at baseline and after 2 weeks of OrthoK lens wear of each contact lens. Results. No significant differences were found between any measurements for the same subject at both baselines (p value > 0.05). There was no difference between OZ lens designs found in refraction, subjective vision or comfort, and HC and LC visual acuity. Contrast sensitivity was decreased in the 5 mm OZ lens design compared with 6 mm OZ design (p-value < 0.05). 5 mm OZ design provoked a greater flattening, more powerful midperipheral ring and 4th-order corneal and total spherical aberration than the 6 mm OZ design, being statistically significant after 7 days, for corneal aberration, and 15 days, for corneal and total, of wearing the lens (p-value < 0.05). The OZT obtained were 2.8 ± 0.2 mm and 3.1 ± 0.1 mm for 5 mm and 6 mm OZ design, respectively (p-value < 0.05). Regarding PRW, the 5 mm OZ design had a wider ring width in both the nasal and temporal zones (p-value < 0.05). Conclusions. A smaller diameter optical zone (5 mm) in orthokeratology lenses produces a smaller treatment area and a larger and more powerful midperipheral ring, increasing the 4th-order spherical aberration that affects only the contrast sensitivity but without differences in visual acuity and subjective vision compared with a larger OZ diameter (6 mm). |
| format | Article |
| id | doaj-art-b7b8b817374e4ded8eef11ce32276530 |
| institution | Kabale University |
| issn | 2090-004X 2090-0058 |
| language | English |
| publishDate | 2019-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Journal of Ophthalmology |
| spelling | doaj-art-b7b8b817374e4ded8eef11ce322765302025-02-03T07:24:28ZengWileyJournal of Ophthalmology2090-004X2090-00582019-01-01201910.1155/2019/10824721082472The Topographical Effect of Optical Zone Diameter in Orthokeratology Contact Lenses in High MyopesG. Carracedo0T. M. Espinosa-Vidal1I. Martínez-Alberquilla2L. Batres3Department of Optics II (Optometry and Vision), Faculty of Optics and Optometry, Complutense University of Madrid, Madrid, SpainDepartment of Optics II (Optometry and Vision), Faculty of Optics and Optometry, Complutense University of Madrid, Madrid, SpainDepartment of Optics II (Optometry and Vision), Faculty of Optics and Optometry, Complutense University of Madrid, Madrid, SpainDepartment of Optics II (Optometry and Vision), Faculty of Optics and Optometry, Complutense University of Madrid, Madrid, SpainPurpose. To evaluate the effect of the optical zone diameter (OZ) in orthokeratology contact lenses regarding the topographical profile in patients with high myopia (−4.00 D to −7.00 D) and to study its effect over the visual quality. Materials and Methods. Twelve patients (18 eyes) were fitted with overnight orthokeratology (OrthoK) with a randomized 6 mm or 5 mm OZ lens worn for 2 weeks, followed by a 2-week washout period, between both designs. Keratometry (K) readings, optical zone treatment diameter (OZT), peripheral ring width (PRW), higher-order aberrations (HOA), high (HC) and low contrast (LC) visual acuity, and subjective vision and comfort were measured at baseline and after 2 weeks of OrthoK lens wear of each contact lens. Results. No significant differences were found between any measurements for the same subject at both baselines (p value > 0.05). There was no difference between OZ lens designs found in refraction, subjective vision or comfort, and HC and LC visual acuity. Contrast sensitivity was decreased in the 5 mm OZ lens design compared with 6 mm OZ design (p-value < 0.05). 5 mm OZ design provoked a greater flattening, more powerful midperipheral ring and 4th-order corneal and total spherical aberration than the 6 mm OZ design, being statistically significant after 7 days, for corneal aberration, and 15 days, for corneal and total, of wearing the lens (p-value < 0.05). The OZT obtained were 2.8 ± 0.2 mm and 3.1 ± 0.1 mm for 5 mm and 6 mm OZ design, respectively (p-value < 0.05). Regarding PRW, the 5 mm OZ design had a wider ring width in both the nasal and temporal zones (p-value < 0.05). Conclusions. A smaller diameter optical zone (5 mm) in orthokeratology lenses produces a smaller treatment area and a larger and more powerful midperipheral ring, increasing the 4th-order spherical aberration that affects only the contrast sensitivity but without differences in visual acuity and subjective vision compared with a larger OZ diameter (6 mm).http://dx.doi.org/10.1155/2019/1082472 |
| spellingShingle | G. Carracedo T. M. Espinosa-Vidal I. Martínez-Alberquilla L. Batres The Topographical Effect of Optical Zone Diameter in Orthokeratology Contact Lenses in High Myopes Journal of Ophthalmology |
| title | The Topographical Effect of Optical Zone Diameter in Orthokeratology Contact Lenses in High Myopes |
| title_full | The Topographical Effect of Optical Zone Diameter in Orthokeratology Contact Lenses in High Myopes |
| title_fullStr | The Topographical Effect of Optical Zone Diameter in Orthokeratology Contact Lenses in High Myopes |
| title_full_unstemmed | The Topographical Effect of Optical Zone Diameter in Orthokeratology Contact Lenses in High Myopes |
| title_short | The Topographical Effect of Optical Zone Diameter in Orthokeratology Contact Lenses in High Myopes |
| title_sort | topographical effect of optical zone diameter in orthokeratology contact lenses in high myopes |
| url | http://dx.doi.org/10.1155/2019/1082472 |
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