The photoreceptors synapse with retinal bipolar cells, which in turn transmit these signals to retinal ganglion cells. rhodopsin) of these cells are stimulated to propagate second messenger responses which convert light energy into electrical signals. Light-sensitive surface membrane proteins (e.g. The photoreceptors (rods and cones) in the retina are stimulated by photons of light entering the eye. It can be more accurately assessed using perimetry studies. The image of an object in the visual field is inverted upside-down and flipped left-to-right on the retina, as illustrated in figure 1.Ĭonfrontational assessment of the visual field is an important part of the cranial nerve examination. The visual field is the entire area that can be seen by a patient without movement of their head and with their eyes fixed on one point. When discussing vision, it is important to understand the visual field and how it differs from the image presented to the retina. You might also be interested in our Anatomy Flashcard Collection which contains over 2000 anatomy flashcards in addition to advanced features such as spaced repetition.
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