一、视觉敏度(Visual acuitg)又称视锐度。它表示视觉辨别物体细节的能力。视觉敏度高,表明视觉辨认微小细节的能力较强,反之则表明这种辨别能力较差。影响视觉敏度的因素有很多,大致包括:物体的大小、观察距离、眼内晶状体的调节能力、视网膜上成像的位置、目标与背景的对比以及照明的各种条 First, visual acuity (Visual acuitg), also known as visual acuity. It expresses the ability to visually recognize the detail of an object. High visual acuity, indicating that the ability to visually identify the small details of strong, otherwise it shows that the ability to distinguish poor. Affect the visual acuity of many factors, including: the size of the object, the observation distance, the accommodation of intraocular lens, the location of the imaging on the retina, the contrast between the target and the background and illumination of the various articles