目的：了解老年人立体视觉状况，为其自身保健和自我保护提供参考与帮助。
Objective: To study the stereoscopic visual condition of the aged people and therefore provide them with assistance in self-health care and injuries prevention.
然而，分辨能力还与大气状况以及观察者的视觉敏锐度有关。
However, resolving power is often compromised by atmospheric conditions and the visual acuity of the observer.
大气状况和观察者的视觉灵敏度也会降低边缘亮度。
Atmospheric conditions and the visual acuity of the observer will often reduce limiting magnitude.
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