[Accommodation response fluctuation in myopia during sustained near work]

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[Accommodation response fluctuation in myopia during sustained near work] Zhonghua Yan Ke Za Zhi. 2009 Jan;45(1):50-5 Authors: Xu D, Chen X, Yan J, Jiang J, Qu J, Lü F OBJECTIVE: To analyze the difference of regressive curves during near work among different refractive groups. To analyze if myope have the higher detection threshold for blur image and to see if the high accommodative response is one of the induced factor for myopia progression. METHOD: The accommodation response of emmetrope, stable myope and progressive myope were measured with the open field autorefractor by the 30 seconds interval during 1 hour near work. Drew the progressive curve and compare the fluctuation of accommodation response during the whole near work. RESULTS: There were no significant difference of accommodation response among three groups before near work (P > 0.05). The fluctuation curve shew rise, calm and then decline trend while progressive myope kept sustaining at high accommodation response level during later period of near work. The discrepancy of stable myope and progressive myope during 1 hour are (0.1905 +/- 0.3619) D and (0.1336 +/- 0.3030)D respectively. Stable myope and progressive myope had the trend of high deviation than emmetropia. 8 subjects among 41 shew accommodation lead during near work while 7 are myopia. CONCLUSION: Accommodation response shew fluctuation trend during sustained near work, the amplitude of fluctuation could reflect the defocus and the sensitivity threshold for blur image. The stable and progressive myope have the higher defocus so they need greater fluctuation to exceed the defocus. PMID: 19484931 [PubMed - in process]

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