Eyes are the beautiful part of our human body and without eye many spending their days on the dark. But many people with good vision and eyes are not taking proper care to maintain their eyes health and its functioning.
Eyes are organs that detect light and convert it into electro-chemical impulses in neurons. The simplest photoreceptors in conscious vision connect light to movement. In higher organisms the eye is a complex optical system which collects light from the surrounding environment, regulates its intensity through a diaphragm, focuses it through an adjustable assembly of lenses to form an image, converts this image into a set of electrical signals, and transmits these signals to the brain through complex neural pathways that connect the eye via the optic nerve to the visual cortex and other areas of the brain.
Vision, Visual acuity, or resolving power, is “the ability to distinguish fine detail” and is the property of cone cells. It is often measured in cycles per degree (CPD), which measures an angular resolution, or how much an eye can differentiate one object from another in terms of visual angles. Resolution in CPD can be measured by bar charts of different numbers of white/black stripe cycles. For example, if each pattern is 1.75 cm wide and is placed at 1 m distance from the eye, it will subtend an angle of 1 degree, so the number of white/black bar pairs on the pattern will be a measure of the cycles per degree of that pattern. The highest such number that the eye can resolve as stripes, or distinguish from a grey block, is then the measurement of visual acuity of the eye.
For a human eye with excellent acuity, the maximum theoretical resolution is 50 CPD (1.2 arcminute per line pair, or a 0.35 mm line pair, at 1 m). Spherical aberration limits the resolution of a 7 mm pupil to about 3 arcminutes per line pair. At a pupil diameter of 3 mm, the spherical aberration is greatly reduced, resulting in an improved resolution of approximately 1.7 arcminutes per line pair. A resolution of 2 arcminutes per line pair, equivalent to a 1 arcminute gap in an optotype, corresponds to 20/20 (normal vision) in humans.
The most necessary vitamins is the anti-oxidant vitamins. The lens and retina of the eyes are easily affected to dust contaminants, unchecked free radicals and cellular process. These anti-oxidant vitamins play a vital role in combating those free radicals. The anti-oxidant vitamins in general include vitamin A, vitamin C and vitamin E. All these vitamins not only help in protecting the eyes from free radicals but also help in promoting healthy cells and tissues necessary for eyes.
Eye examination proves to be worthy as it helps in correcting the vision problem by making use of glasses, contact lenses or by laser treatments. Beyond this the eye examiner i.e., the optometrist will provide you with an advice on how to enhance your visionary health and maintaining it for future.