1/23/2024 0 Comments Entoptic phenomena went awayFor more information, see Tscherning (1920).Ģ. Students may find it easier to make this observation on someone else's eye. If you now move the flashlight in a half circle along your peripheral vision, being careful to always keep the images visible, you will be able to make the two images move to the other side of the pupil, with P2 always closer to the pupil than P1. About 1 mm from this image (P1), toward the pupil, there will be a very much smaller and dimmer second image (P2) as shown in Figure 2. Orient the flashlight so that you can see its light reflected on the cornea in front of the iris. I find it most convenient to use a Mini Maglite (AA batteries) with the lens removed (candle mode). Hold a mirror directly in front of one eye and a flashlight to the side about 0.5 m away. Closer examination reveals a reflection from the posterior (inner) surface, first described by Purkinje (1823) and referred to as "P2" (Purkinje image II) here.įind a location away from bright lights. "Glint" or "sparkle" is light reflected from the anterior (outer) surface of the cornea. Observing the thickness of the cornea by reflecting light off its surfaces. The cornea is the tough transparent membrane at the front of the eye that does most of the focusing of images on the retina (see Figure 1).ġ. Table 1 will give you an idea of the supplies needed. All can be done either alone or in pairs. Any number or combination of the following activities can create interest in and enhance a study of the anatomy of the eye, and some can serve as an introduction to a study of vision and the brain. ![]() Your eye is a very accessible organ for self study. ![]() ![]() Key Words: Blind spot cornea entoptic eye Jovea iris optic nerve Purkinje retina transillumination vision. Features of the cornea, ins, lens, and retina can be explored by students on their own eyes with the 11 activities described in this article.
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