The Role of Back Optic Zone Diameter in Myopia Control with Orthokeratology Lenses
We compared the efficacy of controlling the annual increase in axial length (AL) in myopic Caucasian children based on two parameters: the back optic zone diameter (BOZD) of the orthokeratology (OK) lens and plus power ring diameter (PPRD) or mid-peripheral annular ring of corneal steepening. Data f...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-01-01
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| Series: | Journal of Clinical Medicine |
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| Online Access: | https://www.mdpi.com/2077-0383/10/2/336 |
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| author | Jaume Pauné Silvia Fonts Lina Rodríguez Antonio Queirós |
| author_facet | Jaume Pauné Silvia Fonts Lina Rodríguez Antonio Queirós |
| author_sort | Jaume Pauné |
| collection | DOAJ |
| description | We compared the efficacy of controlling the annual increase in axial length (AL) in myopic Caucasian children based on two parameters: the back optic zone diameter (BOZD) of the orthokeratology (OK) lens and plus power ring diameter (PPRD) or mid-peripheral annular ring of corneal steepening. Data from 71 myopic patients (mean age, 13.34 ± 1.38 years; range, 10–15 years; 64% male) corrected with different BOZD OK lenses (DRL, Precilens) were collected retrospectively from a Spanish optometric clinic. The sample was divided into groups with BOZDs above or below 5.00 mm and the induced PPRD above or below 4.5 mm, and the relation to AL and refractive progression at 12 months was analyzed. Three subgroups were analyzed, i.e., plus power ring (PPR) inside, outside, or matching the pupil. The mean baseline myopia was −3.11 ± 1.46 D and the AL 24.65 ± 0.88 mm. Significant (<i>p</i> < 0.001) differences were found after 12 months of treatment in the refractive error and AL for the BOZD and PPRD. AL changes in subjects with smaller BOZDs decreased significantly regarding larger diameters (0.09 ± 0.12 and 0.15 ± 0.11 mm, respectively); in subjects with a horizontal sector of PPRD falling inside the pupil, the AL increased less (<i>p</i> = 0.035) than matching or outside the pupil groups by 0.04 ± 0.10 mm, 0.10 ± 0.11 mm, and 0.17 ± 0.12 mm, respectively. This means a 76% lesser AL growth or 0.13 mm/year in absolute reduction. OK corneal parameters can be modified by changing the OK lens designs, which affects myopia progression and AL elongation. Smaller BOZD induces a reduced PPRDs that slows AL elongation better than standard OK lenses. Further investigations should elucidate the effect of pupillary diameter, PPRD, and power change on myopia control. |
| first_indexed | 2024-03-09T04:28:25Z |
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| institution | Directory Open Access Journal |
| issn | 2077-0383 |
| language | English |
| last_indexed | 2024-03-09T04:28:25Z |
| publishDate | 2021-01-01 |
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| record_format | Article |
| series | Journal of Clinical Medicine |
| spelling | doaj.art-0f09d10b52cd4479a46dbc5035c1817c2023-12-03T13:37:59ZengMDPI AGJournal of Clinical Medicine2077-03832021-01-0110233610.3390/jcm10020336The Role of Back Optic Zone Diameter in Myopia Control with Orthokeratology LensesJaume Pauné0Silvia Fonts1Lina Rodríguez2Antonio Queirós3Centre Marsden de Terapia Visual, Consulta 156, Centro Medico Teknon, Vilana 12, 08022 Barcelona, SpainCentre Marsden de Terapia Visual, Consulta 156, Centro Medico Teknon, Vilana 12, 08022 Barcelona, SpainIntitute Visual Clinic Center, Pereira 660002, ColombiaClinical and Experimental Optometry Research Lab (CEORLab), Center of Physics, School of Science, University of Minho, Gualtar, 4710-057 Braga, PortugalWe compared the efficacy of controlling the annual increase in axial length (AL) in myopic Caucasian children based on two parameters: the back optic zone diameter (BOZD) of the orthokeratology (OK) lens and plus power ring diameter (PPRD) or mid-peripheral annular ring of corneal steepening. Data from 71 myopic patients (mean age, 13.34 ± 1.38 years; range, 10–15 years; 64% male) corrected with different BOZD OK lenses (DRL, Precilens) were collected retrospectively from a Spanish optometric clinic. The sample was divided into groups with BOZDs above or below 5.00 mm and the induced PPRD above or below 4.5 mm, and the relation to AL and refractive progression at 12 months was analyzed. Three subgroups were analyzed, i.e., plus power ring (PPR) inside, outside, or matching the pupil. The mean baseline myopia was −3.11 ± 1.46 D and the AL 24.65 ± 0.88 mm. Significant (<i>p</i> < 0.001) differences were found after 12 months of treatment in the refractive error and AL for the BOZD and PPRD. AL changes in subjects with smaller BOZDs decreased significantly regarding larger diameters (0.09 ± 0.12 and 0.15 ± 0.11 mm, respectively); in subjects with a horizontal sector of PPRD falling inside the pupil, the AL increased less (<i>p</i> = 0.035) than matching or outside the pupil groups by 0.04 ± 0.10 mm, 0.10 ± 0.11 mm, and 0.17 ± 0.12 mm, respectively. This means a 76% lesser AL growth or 0.13 mm/year in absolute reduction. OK corneal parameters can be modified by changing the OK lens designs, which affects myopia progression and AL elongation. Smaller BOZD induces a reduced PPRDs that slows AL elongation better than standard OK lenses. Further investigations should elucidate the effect of pupillary diameter, PPRD, and power change on myopia control.https://www.mdpi.com/2077-0383/10/2/336orthokeratologymyopia progressionoptic zone diameterpupillary diameteraxial length |
| spellingShingle | Jaume Pauné Silvia Fonts Lina Rodríguez Antonio Queirós The Role of Back Optic Zone Diameter in Myopia Control with Orthokeratology Lenses Journal of Clinical Medicine orthokeratology myopia progression optic zone diameter pupillary diameter axial length |
| title | The Role of Back Optic Zone Diameter in Myopia Control with Orthokeratology Lenses |
| title_full | The Role of Back Optic Zone Diameter in Myopia Control with Orthokeratology Lenses |
| title_fullStr | The Role of Back Optic Zone Diameter in Myopia Control with Orthokeratology Lenses |
| title_full_unstemmed | The Role of Back Optic Zone Diameter in Myopia Control with Orthokeratology Lenses |
| title_short | The Role of Back Optic Zone Diameter in Myopia Control with Orthokeratology Lenses |
| title_sort | role of back optic zone diameter in myopia control with orthokeratology lenses |
| topic | orthokeratology myopia progression optic zone diameter pupillary diameter axial length |
| url | https://www.mdpi.com/2077-0383/10/2/336 |
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