Peripheral refraction of myopic eyes with spectacle lenses correction and lens free emmetropes during accommodation
Abstract Purpose To measure axial and off-axis refraction patterns in myopic eyes with spectacle lenses correction and lens free emmetropes in young healthy subjects at different target distances from 2.00 m (0.50 D) to 0.20 m (5.00 D) in terms of sphere, astigmatism, and spherical equivalent refrac...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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BMC
2021-12-01
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| Series: | Eye and Vision |
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| Online Access: | https://doi.org/10.1186/s40662-021-00267-x |
| _version_ | 1818574462367301632 |
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| author | António Queirós Alejandro Cerviño José Manuel González-Méijome |
| author_facet | António Queirós Alejandro Cerviño José Manuel González-Méijome |
| author_sort | António Queirós |
| collection | DOAJ |
| description | Abstract Purpose To measure axial and off-axis refraction patterns in myopic eyes with spectacle lenses correction and lens free emmetropes in young healthy subjects at different target distances from 2.00 m (0.50 D) to 0.20 m (5.00 D) in terms of sphere, astigmatism, and spherical equivalent refraction. Methods Refraction was measured at the center, 20 and 40 degrees from the line of sight both nasally and temporally in 15 emmetropic and 25 myopic young healthy subjects with an open field, binocular, infrared autorefractor (Grand Seiko WAM-5500, Hiroshima, Japan). Fixation target was a Maltese cross set at 2.00, 0.50, 0.33 and 0.20 m from the corneal plane. Changes in off-axis refraction with accommodation level were normalized with respect to distance axial values and compared between myopic eyes with spectacle lenses correction and lens free emmetropes. Results Off-axis refraction in myopic eyes with spectacle lenses correction was significantly more myopic in the temporal retina compared to lens free emmetropes except for the closest target distance. Relative off-axis refractive error changed significantly with accommodation when compared to axial refraction particularly in the myopic group. This change in the negative direction was due to changes in the spherical component of refraction that became more myopic relative to the center at the 0.20 m distance as the J0 component of astigmatism was significantly reduced in both emmetropes and myopes for the closest target. Conclusion Accommodation to very near targets (up to 0.20 m) makes the off-axis refraction of myopes wearing their spectacle correction similar to that of lens free emmetropes. A significant reduction in off-axis astigmatism was also observed for the 0.20 m distance. |
| first_indexed | 2024-12-15T00:26:58Z |
| format | Article |
| id | doaj.art-91370f40c6e6469aa5d0036a758a9d5d |
| institution | Directory Open Access Journal |
| issn | 2326-0254 |
| language | English |
| last_indexed | 2024-12-15T00:26:58Z |
| publishDate | 2021-12-01 |
| publisher | BMC |
| record_format | Article |
| series | Eye and Vision |
| spelling | doaj.art-91370f40c6e6469aa5d0036a758a9d5d2022-12-21T22:42:08ZengBMCEye and Vision2326-02542021-12-01811810.1186/s40662-021-00267-xPeripheral refraction of myopic eyes with spectacle lenses correction and lens free emmetropes during accommodationAntónio Queirós0Alejandro Cerviño1José Manuel González-Méijome2Clinical & Experimental Optometry Research Lab (CEORLab), Center of Physics (Optometry), University of MinhoOptometry Research Group, Department of Optics and Optometry and Vision Sciences, University of ValenciaClinical & Experimental Optometry Research Lab (CEORLab), Center of Physics (Optometry), University of MinhoAbstract Purpose To measure axial and off-axis refraction patterns in myopic eyes with spectacle lenses correction and lens free emmetropes in young healthy subjects at different target distances from 2.00 m (0.50 D) to 0.20 m (5.00 D) in terms of sphere, astigmatism, and spherical equivalent refraction. Methods Refraction was measured at the center, 20 and 40 degrees from the line of sight both nasally and temporally in 15 emmetropic and 25 myopic young healthy subjects with an open field, binocular, infrared autorefractor (Grand Seiko WAM-5500, Hiroshima, Japan). Fixation target was a Maltese cross set at 2.00, 0.50, 0.33 and 0.20 m from the corneal plane. Changes in off-axis refraction with accommodation level were normalized with respect to distance axial values and compared between myopic eyes with spectacle lenses correction and lens free emmetropes. Results Off-axis refraction in myopic eyes with spectacle lenses correction was significantly more myopic in the temporal retina compared to lens free emmetropes except for the closest target distance. Relative off-axis refractive error changed significantly with accommodation when compared to axial refraction particularly in the myopic group. This change in the negative direction was due to changes in the spherical component of refraction that became more myopic relative to the center at the 0.20 m distance as the J0 component of astigmatism was significantly reduced in both emmetropes and myopes for the closest target. Conclusion Accommodation to very near targets (up to 0.20 m) makes the off-axis refraction of myopes wearing their spectacle correction similar to that of lens free emmetropes. A significant reduction in off-axis astigmatism was also observed for the 0.20 m distance.https://doi.org/10.1186/s40662-021-00267-xOff-axis refractionRefractive errorAccommodationMyopia progression |
| spellingShingle | António Queirós Alejandro Cerviño José Manuel González-Méijome Peripheral refraction of myopic eyes with spectacle lenses correction and lens free emmetropes during accommodation Eye and Vision Off-axis refraction Refractive error Accommodation Myopia progression |
| title | Peripheral refraction of myopic eyes with spectacle lenses correction and lens free emmetropes during accommodation |
| title_full | Peripheral refraction of myopic eyes with spectacle lenses correction and lens free emmetropes during accommodation |
| title_fullStr | Peripheral refraction of myopic eyes with spectacle lenses correction and lens free emmetropes during accommodation |
| title_full_unstemmed | Peripheral refraction of myopic eyes with spectacle lenses correction and lens free emmetropes during accommodation |
| title_short | Peripheral refraction of myopic eyes with spectacle lenses correction and lens free emmetropes during accommodation |
| title_sort | peripheral refraction of myopic eyes with spectacle lenses correction and lens free emmetropes during accommodation |
| topic | Off-axis refraction Refractive error Accommodation Myopia progression |
| url | https://doi.org/10.1186/s40662-021-00267-x |
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