Relationship between contrast sensitivity and corneal shape following overnight orthokeratology
AIM: To evaluate the relationship between contrast sensitivity (CS) and corneal shape following overnight orthokeratology (OK). METHODS: We conducted a retrospective clinical study of 80 lens-wearing myopia patients, all of whom had undergone OK and had been evaluated by Orbscan II topography. We m...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Press of International Journal of Ophthalmology (IJO PRESS)
2019-02-01
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| Series: | International Journal of Ophthalmology |
| Subjects: | |
| Online Access: | http://www.ijo.cn/en_publish/2019/2/20190214.pdf |
| _version_ | 1811205375266914304 |
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| author | Li-Li Liu Li-Ping Gong Yue-Yuan Xu Xuan Zhu Kaddie Kwok Chen Wei-Feng Liu |
| author_facet | Li-Li Liu Li-Ping Gong Yue-Yuan Xu Xuan Zhu Kaddie Kwok Chen Wei-Feng Liu |
| author_sort | Li-Li Liu |
| collection | DOAJ |
| description | AIM: To evaluate the relationship between contrast sensitivity (CS) and corneal shape following overnight orthokeratology (OK).
METHODS: We conducted a retrospective clinical study of 80 lens-wearing myopia patients, all of whom had undergone OK and had been evaluated by Orbscan II topography. We measured the surface irregularity index (SIRI) of corneal topography at 3 and 5 mm, the size of the flattened central corneal curvature of OK lens (zone A), the size of the cornea altered by OK lens (zone B), the size of the pupillary area at the corneal level (zone C), the area of crossover between zones A and C (zone AC), the area of crossover between zones B and C (BC), the ratio of BC to B (BC/B), and the ratio of AC to C (AC/C). CS was evaluated using the CSV-1000 with spatial frequencies of 3, 6, 12, and 18 cycles/degree (CPD).
RESULTS: Multiple correlation analyses indicated significant negative correlations between CS, zone C, BC/B, and 3-mm SIRI (all P<0.01). There were no significant differences between CS, zone B, AC/A, or 5-mm SIRI (P=0.60, 0.94 and 0.11, respectively). Zone C was negatively correlated with 3, 6, 12, and 18 CPD. 5-mm SIRI were negatively correlated with 6, 12, and 18 CPD. BC/C was negatively correlated with 6 and 18 CPD. AC/C was positively correlated with 3 CPD.
CONCLUSION: Zone C, 3-mm SIRI and BC/B affect the CS following overnight OK. |
| first_indexed | 2024-04-12T03:31:30Z |
| format | Article |
| id | doaj.art-c77a27f39d2a4ba088bf85e86a57b9e1 |
| institution | Directory Open Access Journal |
| issn | 2222-3959 2227-4898 |
| language | English |
| last_indexed | 2024-04-12T03:31:30Z |
| publishDate | 2019-02-01 |
| publisher | Press of International Journal of Ophthalmology (IJO PRESS) |
| record_format | Article |
| series | International Journal of Ophthalmology |
| spelling | doaj.art-c77a27f39d2a4ba088bf85e86a57b9e12022-12-22T03:49:33ZengPress of International Journal of Ophthalmology (IJO PRESS)International Journal of Ophthalmology2222-39592227-48982019-02-0112227527910.18240/ijo.2019.02.14Relationship between contrast sensitivity and corneal shape following overnight orthokeratologyLi-Li Liu0Li-Ping Gong1Yue-Yuan Xu2Xuan Zhu3Kaddie Kwok Chen4Wei-Feng Liu5The Eye Hospital of Nanchang University, Nanchang 330000, Jiangxi Province, ChinaThe Second Affiliated Hospital of Nanchang University, Nanchang 330000, Jiangxi Province, ChinaThe Third Affiliated Hospital of Nanchang University, Nanchang 330000, Jiangxi Province, ChinaThe Third Affiliated Hospital of Nanchang University, Nanchang 330000, Jiangxi Province, ChinaThe Third Affiliated Hospital of Nanchang University, Nanchang 330000, Jiangxi Province, China; Department of Ophthalmology, University of California San Francisco, San Francisco, CA 94131, USAThe Third Affiliated Hospital of Nanchang University, Nanchang 330000, Jiangxi Province, ChinaAIM: To evaluate the relationship between contrast sensitivity (CS) and corneal shape following overnight orthokeratology (OK). METHODS: We conducted a retrospective clinical study of 80 lens-wearing myopia patients, all of whom had undergone OK and had been evaluated by Orbscan II topography. We measured the surface irregularity index (SIRI) of corneal topography at 3 and 5 mm, the size of the flattened central corneal curvature of OK lens (zone A), the size of the cornea altered by OK lens (zone B), the size of the pupillary area at the corneal level (zone C), the area of crossover between zones A and C (zone AC), the area of crossover between zones B and C (BC), the ratio of BC to B (BC/B), and the ratio of AC to C (AC/C). CS was evaluated using the CSV-1000 with spatial frequencies of 3, 6, 12, and 18 cycles/degree (CPD). RESULTS: Multiple correlation analyses indicated significant negative correlations between CS, zone C, BC/B, and 3-mm SIRI (all P<0.01). There were no significant differences between CS, zone B, AC/A, or 5-mm SIRI (P=0.60, 0.94 and 0.11, respectively). Zone C was negatively correlated with 3, 6, 12, and 18 CPD. 5-mm SIRI were negatively correlated with 6, 12, and 18 CPD. BC/C was negatively correlated with 6 and 18 CPD. AC/C was positively correlated with 3 CPD. CONCLUSION: Zone C, 3-mm SIRI and BC/B affect the CS following overnight OK.http://www.ijo.cn/en_publish/2019/2/20190214.pdforthokeratologycontrast sensitivitypupil size areashaped corneamyopia |
| spellingShingle | Li-Li Liu Li-Ping Gong Yue-Yuan Xu Xuan Zhu Kaddie Kwok Chen Wei-Feng Liu Relationship between contrast sensitivity and corneal shape following overnight orthokeratology International Journal of Ophthalmology orthokeratology contrast sensitivity pupil size area shaped cornea myopia |
| title | Relationship between contrast sensitivity and corneal shape following overnight orthokeratology |
| title_full | Relationship between contrast sensitivity and corneal shape following overnight orthokeratology |
| title_fullStr | Relationship between contrast sensitivity and corneal shape following overnight orthokeratology |
| title_full_unstemmed | Relationship between contrast sensitivity and corneal shape following overnight orthokeratology |
| title_short | Relationship between contrast sensitivity and corneal shape following overnight orthokeratology |
| title_sort | relationship between contrast sensitivity and corneal shape following overnight orthokeratology |
| topic | orthokeratology contrast sensitivity pupil size area shaped cornea myopia |
| url | http://www.ijo.cn/en_publish/2019/2/20190214.pdf |
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