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About 1 mm decrease in axial length cause 3 diopters of hypermetropia. [2] One condition that cause axial hypermetropia is nanophthalmos. [12] Curvatural: Curvatural hypermetropia occur when curvature of lens or cornea is flatter than normal. About 1 mm increase in radius of curvature results in 6 diopters of hypermetropia. [2]
The number of people globally with refractive errors has been estimated at one to two billion. [4] Rates vary between regions of the world with about 25% of Europeans and 80% of Asians affected. [4] Near-sightedness is the most common disorder. [6] Rates among adults are between 15 and 49% while rates among children are between 1.2 and 42%. [7]
Other types of refractive errors may exist at the same time as presbyopia. [1] This condition is similar to hypermetropia or far-sightedness, which starts in childhood and exhibits similar symptoms of blur in the vision for close objects. Presbyopia is a typical part of the aging process. [4]
Measurements of speech tempo can be strongly affected by pauses and hesitations. For this reason, it is usual to distinguish between speech tempo including pauses and hesitations and speech tempo excluding them. The former is called speaking rate and the latter articulation rate. [2] Various units of speech have been used as a basis for ...
The prescription consists of all the specifications necessary to make the lens. Prescriptions typically include the power specifications of each lens (for each eye). Strengths are generally prescribed in quarter-diopter steps (0.25 D), because most people cannot generally distinguish between smaller increments (e.g., eighth-diopter steps / 0. ...
Speech agnosia: Pure word deafness, or speech agnosia, is an impairment in which a person maintains the ability to hear, produce speech, and even read speech, yet they are unable to understand or properly perceive speech. These patients seem to have all of the skills necessary in order to properly process speech, yet they appear to have no ...
The researchers concluded that the findings suggest “complex” interactions between CMV and certain changes in the body can increase the odds of developing Alzheimer’s disease.
Presbyopia is a visual condition that causes farsightedness. The eye's lens becomes too inflexible to accommodate to normal reading distance, focus tending to remain fixed at long distance. Glaucoma is a type of blindness that begins at the edge of the visual field and progresses inward.