Effect of focus on visual acuity of human infants.
Effect of focus on visual acuity of human infants.
复制标题
焦点对人类婴儿视力的影响。
DOI：
10.1016/0042-6989(82)90110-9
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发表时间：
1982
期刊：
影响因子：
1.8
通讯作者：
Dobson,V
中科院分区：
文献类型：
--
作者：
Powers,MK;Dobson,V
最近的理论论点（Greenet al.(1980)Viston res . 20,827 - 835）预测，与成年人相比，年幼的人类婴儿应该有更大的聚焦深度。如果是这样，光学模糊应该对婴儿的分辨能力有相对较小的影响。我们通过测量光学模糊对6周龄婴儿和成人的锐度阈值的影响来验证这一假设。使用强制选择优先观察（FPL）技术，我们获得了五种不同透镜功率（钢琴、- 14d、- 3D、+ 6d和+ 14d）下每个受试者的锐度阈值。所有受试者的视力受透镜倍率的影响是不同的，低倍率透镜的视力最好，而高倍率透镜的视力最差。然而，高倍率镜片（正负倍率）对婴儿的影响要比成人小得多。虽然在不知道婴儿的确切适应状态的情况下，负面效应很难解释，但正面效应的结果支持了理论预测。
Recent theoretical arguments (Greenet al.(1980)Viston Res.20, 827–835) predict that young human infants should have large depths of focus compared to adults. If so, optical blur should have relatively little effect on the resolving power of infant subjects. We tested this hypothesis by measuring the influence of optical blur on acuity thresholds in 6-week old infants and adults. Using the forcedchoice preferential looking (FPL) technique, we obtained acuity thresholds for each subject with five different lens powers (piano, −14 D, −3D, +6 D and +14 D). Acuity was differentially affected by lens power in all subjects, with the best acuity found with low power lenses and the worst with the highest power lenses. However, the amount of reduction in acuity produced by high power lenses, both plus and minus, was considerably less for infants than for adults. Although the effects ofnegativelenses are difficult to interpret without knowing the infants' exact accommodative state, the results withpositivelenses support the theoretical predictions.