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The prevalence of myopia has been reported as high as 70–90% in some Asian countries, 30–40% in Europe and the United States, and 10–20% in Africa. [130] Myopia is about twice as common in Jewish people than in people of non-Jewish ethnicity. [132] Myopia is less common in African people and associated diaspora. [129]
In studies of the genetic predisposition of refractive error, there is a correlation between environmental factors and the risk of developing myopia. [24] Myopia has been observed in individuals with visually intensive occupations. [23] Reading has also been found to be a predictor of myopia in
Visual or vision impairment (VI or VIP) is the partial or total inability of visual perception.In the absence of treatment such as corrective eyewear, assistive devices, and medical treatment, visual impairment may cause the individual difficulties with normal daily tasks, including reading and walking. [6]
If the brain never learns to see objects in detail, then there is a high chance of one eye becoming dominant. The result is that the brain will block the impulses of the non-dominant eye. In contrast, the child with myopia can see objects close to the eye in detail and does learn at an early age to see objects in detail. [medical citation needed]
Spherical aberration exacerbates myopia in low light (night myopia). In brighter conditions, the pupil constricts, blocking the more peripheral rays and minimizing the effect of spherical aberration. As the pupil enlarges, more peripheral rays enter the eye and the focus shifts anteriorly, making the patient slightly more myopic in low-light ...
The largest letter on an eye chart often represents an acuity of 6/60 (20/200), the value that is considered "legally blind" in the US. Many individuals with high myopia cannot read the large E without glasses, but can read the 6/6 (20/20) line or 6/4.5 (20/15) line with glasses. By contrast, legally blind individuals have a visual acuity of 6/ ...
In both cases, the reading scores were lower than in the first year of testing, in 1992. And in the case of eighth-graders, it was the lowest score ever recorded. (Scores were down last year and ...
Nerve problems can cause damage to the control of eye muscles which can also cause diplopia." [17] Students with dyslexia require a tailored approach in writing courses due to the impact of their neurological condition on their reading, writing, and spelling abilities.