Repository of Research and Investigative Information

Repository of Research and Investigative Information

Zahedan University of Medical Sciences

Effect of target distance on accommodative amplitude measured using the minus lens technique

(2014) Effect of target distance on accommodative amplitude measured using the minus lens technique. Clinical and Experimental Optometry. pp. 62-65. ISSN 0816-4622

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Official URL: <Go to ISI>://WOS:000328610800010

Abstract

BackgroundThe aim was to investigate the effect on the measured amplitude of accommodation and repeatability of using the minus lens technique with the target at distance or near. MethodsForty-three students (average age: 21.17 1.50 years, 35 female) had their amplitude of accommodation measured with minus lenses on top of their distance correction in a trial frame with the target at far (6.0m) or near (0.4m). The minus lens power was gradually added with steps of 0.25D. Measurements were taken on two occasions at each distance, which were separated by a time interval of at least 24 hours. ResultsThe measured amplitude at six metres was significantly lower than that with the target at 40cm, by 1.56 +/- 1.17D (p < 0.001) and this varied between individuals (r = 0.716, intraclass correlation coefficient = 0.439). With either target distance, repeated measurement was highly correlated (r > 0.9) but the agreement was better at 6.0m (+/- 0.74D) than at 40cm (+/- 0.92D). ConclusionThe measurements of the amplitude of accommodation with the minus lens technique using targets at far or near are not comparable and the difference between the target distances may provide clinically relevant information.

Item Type: Article
Keywords: accommodation amplitude agreement minus lens method repeatability repeatability agreement Ophthalmology
Page Range: pp. 62-65
Journal or Publication Title: Clinical and Experimental Optometry
Journal Index: ISI
Volume: 97
Number: 1
Identification Number: https://doi.org/10.1111/cxo.12090
ISSN: 0816-4622
Depositing User: خانم مهدیه رضائی پور
URI: http://eprints.zaums.ac.ir/id/eprint/2261

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