This illustrates why some persons can see clearly outdoors on a sunny day but have poorer clarity of vision by night. Persons with minor eye defects may see objects more clearly when looking through a small hole produced by coiling the hand. By turning the cylindrical lens slightly, one line alone of the object pattern can be made sharp, while the others are blurred. Combine test 3 and 5, using both a cylindrical and spherical focusing lens at the same time in front of the cornea. In actual practice the two correcting lenses are combined into a single compound eyeglass lens.
Good vision is still possible, however, with the use of a suitable correcting lens.
You should have a clearly focused image. A clear image will be formed if the lamp box is brought very near. If not, describe the difference. If not, describe the difference. Note in which case objects appear to move with the lens and which against.