This is well visualized on standard optical coherence tomography (OCT) that can characterize foveal thickness. A unique feature of the central fovea is the displacement of other retinal layers concentrically, which allows for the highly efficient packing of cones. Given this high cellular concentration, it is expectedly the location of the highest visual acuity, or resolution, in the eye. Furthermore, the fovea has about 50 cone cells per 100 micrometers squared and has an elliptical shape horizontally. The macula is about 5.5 mm in diameter, while the fovea is 0.35 mm in diameter. As the fovea is responsible for high-acuity vision it is densely saturated with cone photoreceptors. The fovea centralis is located in the center of the macula lutea, a small, flat spot located exactly in the center of the posterior portion of the retina. The fovea itself is the central portion of the macula, which is responsible for central vision. The fovea centralis, or fovea, is a small depression within the neurosensory retina where visual acuity is the highest. For example, an object appears white if it reflects all wavelengths of light and it appears black if it absorbs all wavelengths of light. The color of an object is actually a manifestation of the wavelength that is reflected and not that which is absorbed. Objects can absorb and reflect different wavelengths of light, which in turn, are detected by the eye. The eyes are responsible for detecting visible light, which ranges from 400 to 700 nanometers in wavelength. More than 50% of the sensory receptors in the human body are located in the eyes, and a significant portion of the cerebral cortex is devoted to interpreting visual information.
0 Comments
Leave a Reply. |