Accommodative amplitude using the minus lens at different near distances
Purpose: The purpose of this study was to compare the mean findings and the repeatability of the minus lens (ML) amplitude of accommodation (AA) at 33 cm and 40 cm. Materials and Methods: AA was measured from the dominant eye of 120 fully corrected subjects using the ML procedure when viewing the ta...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Wolters Kluwer Medknow Publications
2017-01-01
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| Series: | Indian Journal of Ophthalmology |
| Subjects: | |
| Online Access: | http://www.ijo.in/article.asp?issn=0301-4738;year=2017;volume=65;issue=3;spage=223;epage=227;aulast=Momeni-Moghaddam |
| _version_ | 1811324337473454080 |
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| author | Hamed Momeni-Moghaddam Jason S Ng Bruno Mario Cesana Abbas Ali Yekta Mohammad Reza Sedaghat |
| author_facet | Hamed Momeni-Moghaddam Jason S Ng Bruno Mario Cesana Abbas Ali Yekta Mohammad Reza Sedaghat |
| author_sort | Hamed Momeni-Moghaddam |
| collection | DOAJ |
| description | Purpose: The purpose of this study was to compare the mean findings and the repeatability of the minus lens (ML) amplitude of accommodation (AA) at 33 cm and 40 cm. Materials and Methods: AA was measured from the dominant eye of 120 fully corrected subjects using the ML procedure when viewing the target at both 33 and 40 cm. Each measurement was repeated between 24 and 48 hours after the first trial. Results: Mean AA when tested at 33 cm and 40 cm was 10.20 diopter (D) (standard deviation [SD] =1.24) and 8.85 D (SD = 1.23), respectively (P < 0.001). The limits of agreement of the measured amplitude calculated with taking into account of the replicates at 33 and 40 cm were − 0.19 (95% confidence interval [CI]: −0.34 to −0.04) and 2.53 (95% CI: 2.38 to 2.68), respectively. The repeatability of testing at the two distances 33 and 40 cm was ± 1.24 and ± 0.99, respectively. In addition, the retest reliability of measured amplitude using the intraclass correlation coefficient was 0.87 (95% CI: 0.789–0.920) at 33 cm and 0.91 (95% CI: 0.872–0.945) at 40 cm. Conclusion: There is no agreement in the obtained amplitude at the two measurement distances. Testing the ML AA at 40 cm may be superior given that a lower repeatability coefficient was observed. However, it is unclear whether the larger amplitude measured at 33 cm reflects a larger increase in accommodation (greater proximity effect) or a decrease in the ability to perceive the first slight sustained blur. |
| first_indexed | 2024-04-13T14:12:31Z |
| format | Article |
| id | doaj.art-d8c7bd99492443d58566752cc355a514 |
| institution | Directory Open Access Journal |
| issn | 0301-4738 1998-3689 |
| language | English |
| last_indexed | 2024-04-13T14:12:31Z |
| publishDate | 2017-01-01 |
| publisher | Wolters Kluwer Medknow Publications |
| record_format | Article |
| series | Indian Journal of Ophthalmology |
| spelling | doaj.art-d8c7bd99492443d58566752cc355a5142022-12-22T02:43:45ZengWolters Kluwer Medknow PublicationsIndian Journal of Ophthalmology0301-47381998-36892017-01-0165322322710.4103/ijo.IJO_545_16Accommodative amplitude using the minus lens at different near distancesHamed Momeni-MoghaddamJason S NgBruno Mario CesanaAbbas Ali YektaMohammad Reza SedaghatPurpose: The purpose of this study was to compare the mean findings and the repeatability of the minus lens (ML) amplitude of accommodation (AA) at 33 cm and 40 cm. Materials and Methods: AA was measured from the dominant eye of 120 fully corrected subjects using the ML procedure when viewing the target at both 33 and 40 cm. Each measurement was repeated between 24 and 48 hours after the first trial. Results: Mean AA when tested at 33 cm and 40 cm was 10.20 diopter (D) (standard deviation [SD] =1.24) and 8.85 D (SD = 1.23), respectively (P < 0.001). The limits of agreement of the measured amplitude calculated with taking into account of the replicates at 33 and 40 cm were − 0.19 (95% confidence interval [CI]: −0.34 to −0.04) and 2.53 (95% CI: 2.38 to 2.68), respectively. The repeatability of testing at the two distances 33 and 40 cm was ± 1.24 and ± 0.99, respectively. In addition, the retest reliability of measured amplitude using the intraclass correlation coefficient was 0.87 (95% CI: 0.789–0.920) at 33 cm and 0.91 (95% CI: 0.872–0.945) at 40 cm. Conclusion: There is no agreement in the obtained amplitude at the two measurement distances. Testing the ML AA at 40 cm may be superior given that a lower repeatability coefficient was observed. However, it is unclear whether the larger amplitude measured at 33 cm reflects a larger increase in accommodation (greater proximity effect) or a decrease in the ability to perceive the first slight sustained blur.http://www.ijo.in/article.asp?issn=0301-4738;year=2017;volume=65;issue=3;spage=223;epage=227;aulast=Momeni-MoghaddamAmplitude of accommodationminus lens techniquenear workrepeatability |
| spellingShingle | Hamed Momeni-Moghaddam Jason S Ng Bruno Mario Cesana Abbas Ali Yekta Mohammad Reza Sedaghat Accommodative amplitude using the minus lens at different near distances Indian Journal of Ophthalmology Amplitude of accommodation minus lens technique near work repeatability |
| title | Accommodative amplitude using the minus lens at different near distances |
| title_full | Accommodative amplitude using the minus lens at different near distances |
| title_fullStr | Accommodative amplitude using the minus lens at different near distances |
| title_full_unstemmed | Accommodative amplitude using the minus lens at different near distances |
| title_short | Accommodative amplitude using the minus lens at different near distances |
| title_sort | accommodative amplitude using the minus lens at different near distances |
| topic | Amplitude of accommodation minus lens technique near work repeatability |
| url | http://www.ijo.in/article.asp?issn=0301-4738;year=2017;volume=65;issue=3;spage=223;epage=227;aulast=Momeni-Moghaddam |
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