Light Refraction Experiment

An eye is the composite system which harmonious work provides normal vision. If to compare it to the camera, then accommodation is an ability to change a focusing point, that is, legibly to see that subject which interests at present. Such ability is reflex, and therefore it is rather simple to person to translate a view of the necessary subject that legibly to see it.
Light refraction, getting on a retina, is carried out through a crystalline lens. It is composed of fibers. It depends on it what subject will be visible legibly. Not only the crystalline lens, but also radial and circular muscles regulate a crystalline lens tension. The crystalline lens is not a solid body – it’s elastic allows to change light refraction angle. It is the making

This form of myopia is attributed to the use of the eyes for close work during the school years. I will use the results of diagnosed people between 14-18 years old because at that period of studying at school the teaching loads are very high.
In my study I will consider diopters as the measure of the level of myopia and the length of eye ball. Usually the average length of adult’s eye ball is 24 mm. In this case the ratio of the length of the eye (anteroposterior dimension) to the height/width of the eye (transverse dimension) is larger than 1.0. Roughly 1 mm in length corresponds to ‐ 3.0 D.
McKnight et al. reported: "myopic refractive error was inversely associated with objectively measured ocular sun exposure … There was an inverse relationship between myopic refractive error and ocular sun exposure, with more than double the prevalence of myopia in the lowest quartile of conjunctiva auto fluorescence than the highest quartile (33.0% vs 15.6%)". These results can at least partly explain the high incidence of myopia in Asian countries, where exposure to the sunlight is traditionally avoided. The current fright of skin cancer adds to an increase in the onset of myopia. Donovan et al. summarized their results: "Myopia progression in summer months was approximately 60% of that seen in winter, and axial elongation was likewise significantly less in summer. It is unclear whether more time spent outdoors in summer vs. winter is a contributing factor, or the difference in progression rates is a result of "seasonal" variations in the intensity or amount of close work