The size of the pupil is controlled by muscles within the iris - one muscle constricts the pupil opening (makes it smaller), and another iris muscle dilates the pupil (makes it larger). Using the analogy of a camera, the pupil is the aperture of the eye and the iris is the diaphragm that controls the size of the aperture. ![]() Together, the iris and pupil control how much light enters the eye. This is due to the intense light from the flash being reflected by the red color of the retina. Depending on your direction of gaze when the photo is taken, your pupils might appear bright red. Someone takes your photo using the camera's flash function. There's another common situation when the pupil of the eye changes color - when When the cloudy lens is replaced by a clear intraocular lens (IOL) during cataract surgery, the normal black appearance of the pupil is restored. If the pupil has a cloudy or pale color, typically this is because the lens of the eye (which is located directly behind the pupil) has become opaque due to the formation of a cataract. The black color is because light that passes through the pupil is absorbed by the retina and is not reflected back (in normal lighting). Typically, the pupils appear perfectly round, equal in size and black in color. ![]() ![]() The function of the pupil is to allow light to enter the eye so it can be focused on the retina to begin the process of sight. The pupil is the opening in the center of the iris (the structure that gives our eyes their color). One of the most important parts of the eye isn't a structure at all - it's an open space.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |