Increased accommodation following adaptation to image blur in myopes.
Increased accommodation following adaptation to image blur in myopes.
复制标题
近视眼适应图像模糊后适应性增加。
DOI：
10.1167/4.12.10
复制
发表时间：
2004
影响因子：
1.8
通讯作者：
Held,Richard
中科院分区：
文献类型：
--
作者：
Vera-Diaz,FuensantaA;Gwiazda,Jane;Thorn,Frank;Held,Richard
长时间接触模糊的图像会产生感知适应（MA韦伯斯特，MA，Georgeson，& SM韦伯斯特，2002）。本研究的目的是测试是否除了报告的变化，在感知模糊也有一个变化的调节。年轻成人（18至31岁）近视（n= 23）和正视眼（n= 17）受试者参与了这项研究。近视患者接受隐形眼镜测试，矫正单眼视力为20/20或更好。用PowerRefractor（一种偏心红外摄影验光仪）测量双眼调节。在模糊曝光3分钟之前和之后立即测量近距离目标（0.33 m处的高对比度文本）的调节2分钟。在双眼前方使用0.2 Bangerter漫射滤光片诱导模糊。此外，在近距离测量之前和之后测量远目标（4.0 m处的高对比度字母）的调节，每个受试者的初始远距离读数用作计算近距离反应的基线。与适应前相比，近视组的近视程度有显著性差异（p<0.05）。01)模糊适应3 min后，正视眼的近距离反射反应增加，而对近距离目标的调节没有改变。在第二个实验中，使用单眼观看，增加的调节发现近视发生在模糊曝光期间。屈光组的屈光反应差异可能与正常视觉条件下近视眼和正视眼之间对图像清晰度的习惯性反应差异有关。
Prolonged exposure to blurred images produces perceptual adaptation (MA Webster, MA, Georgeson, & SM Webster, 2002). The purpose of this study is to test whether in addition to the reported change in perceived blur there is also a change in accommodation. Young adult (aged 18 to 31 years) myopic (n= 23) and emmetropic (n= 17) subjects participated in the study. Myopes were tested with contact lenses and had corrected monocular visual acuity of 20/20 or better. Accommodation was measured binocularly with a PowerRefractor, an eccentric infrared photorefractor. Accommodation for a near target (high-contrast text at 0.33 m) was measured for 2 min before and immediately after 3 min of blur exposure. Blur was induced using 0.2 Bangerter diffusing filters in front of both eyes. In addition, accommodation was measured for a far target (high-contrast letters at 4.0 m) before and after the near measurements, with each subject’s initial far readings used as a baseline for calculating the accommodative responses at near. Compared to the pre-adaptation level, myopes showed a significant (p<. 01) increase in the near accommodative response after 3 min of blur adaptation, while accommodation to the near target in emmetropes did not change. In a second experiment using monocular viewing, the increase of accommodation found in myopes was shown to occur during the period of blur exposure. The refractive group differences in the accommodative response may be related to differences in the habitual response to image clarity between myopes and emmetropes under normal viewing conditions.