The retina, then, is a nerve pad dependent upon a complex network of support systems. One of these support systems is a supply of blood, for it is in the blood that many of the essential nutrients are carried from one part of the body to another. Therefore the eye, and more particularly the retina, is or can be affected by deficiencies in other organs. The retina is in fact fed by blood systems both in front and behind, and many blood diseases can have a deleterious effect on retinal functions; and both systems are sufficiently intricate and fine to be hypersensitive to abnormalities in the blood. However, since the variations and permutations of retinal degeneracy are enormous it is sometimes very difficult to diagnose its cause. It is always possible to describe what one sees as being wrong with a decayed retina, but even after many specialized tests it can still be impossible to say with any accuracy what is the precise cause. This has seriously hampered the treatment of some retinal conditions. Where the cause of a disease is known it is always much easier to prescribe a cure, or at least medication that will halt or slow down what is usually a progressive condition. Read the rest of this entry »
The greater the ophthalmologist’s knowledge of general disorders, the more help he will be in their diagnosis, or at least in making a wise referral. And this applies as much to nervous disorders as it does to diseases in the blood. The central nervous system is necessarily and intimately connected with the eye and vision, which are therefore affected by nerve and brain abnormalities. Read the rest of this entry »
People whose eyes are stressed often see fleeting images. These are similar to the images on a television screen after a station has signed off: patterns and colors that move about but often appear gray and diffused. The eyes even mirror mental restlessness. You experience this as swishing images and incomplete darkness when you close your eyes.
Therefore, this exercise is a good way to measure your rental state, as well as your eyesight. When you shield tour eyes, the transition from a shimmering, gray state to leep blackness indicates the change from actively seeing o a totally relaxed, restful state. Read the rest of this entry »
The term orthokeratology comes from the words ortho, meaning “straight,” and keratology, relating to the cornea. It should come as no surprise then that this form of vision therapy seeks to actually change the curvature of the cornea—in order to lessen the refractive error. Using much the same principle as an orthodontist employs when using braces to correct the position of wayward teeth, orthokeratology utilizes a series of relatively flat, hard PMMA contact lenses to mold the cornea gradually into the desired shape. Read the rest of this entry »
