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视深的大小由物体和观察者所处介质情况以及观察者的位置情况两方面共同决定的.观察者和物体所处位置不同,如分别处在光疏介质和光密介质中情况不同,观察到的像的位置的变化情况就不同.当观察者通过光疏介质去看光密介质中的物体时,视深会随着观察角度的增加而变小,而且像的位置也更加靠近观察者;反之,假如观察者由光密介质去看光疏介质中的物体时(如潜水员观察水面上的物体或者水中的鱼观察陆地上的景物等),视深就会随着观察角度的增加而变大,且像的位置也会越来越远离观察者.
The size of the depth of field is determined by both the situation of the medium in which the object and the observer are located and the position of the observer, and the position of the observer and the object is different, as is the case with the light-sparse medium and the light-dense medium, respectively When the observer looks at the object in the optical medium through the optical thinning medium, the depth of field becomes smaller as the observation angle increases, and the position of the image is closer to the observer. On the other hand, if an observer looks at an optically clear medium by an optically dense medium (such as a diver observing an object on the surface of the water or a fish in the water observing a scene on the ground, etc.), the apparent depth changes as the viewing angle increases Large, and like the location will be more and more away from the observer.