https://scholars.lib.ntu.edu.tw/handle/123456789/639040
標題: | Accommodative adaptation and age of onset of myopia | 作者: | LIN-CHUNG WOUNG Ukai, K Tsuchiya, K Ishikawa, S |
公開日期: | 十月-1993 | 卷: | 13 | 期: | 4 | 來源出版物: | Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists) | 摘要: | Tonic accommodation in an empty field and accommodative adaptation, defined as accommodation shift after 2 min viewing of a 4 D near task, were measured using an infrared optometer. Subjects were classified into three types: emmetropes (n = 18), early onset myopes (n = 18) and late onset myopes (n = 15). The relationship between accommodative adaptation and the onset age of myopia were compared. There was no statistical difference in the pre-task tonic accommodation among the three subject groups. However, the accommodative adaptation differed in the three groups during the 5 min post-task period. The average accommodative adaptation of emmetropia, early onset myopia and late onset myopia were 0.66, 0.27 and 1.19 D, respectively. Accommodative adaptation in the late onset myopia group was significantly higher than in the emmetropia group. Furthermore, the accommodative adaptation in the early onset myopia group was significantly lower than in the emmetropia group. Two possible aetiologies of myopia are discussed: one for the group which shows low accommodative adaptation that has no relationship with the age of onset and another for the group which shows high accommodative adaptation that has a relationship to an onset age of 15 years or later. The aetiology is also considered with regard to a potentiating chemical effect on the synapses of the ciliary muscle. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/639040 | ISSN: | 0275-5408 | DOI: | 10.1111/j.1475-1313.1993.tb00492.x |
顯示於: | 醫學系 |
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