<unk> -sighted vision on left, normal vision on right Human eye cross-section A diagnosis of<unk>  is made by utilizing either a retinoscope or an automated refractor-objective refraction; or trial lenses in a trial frame or a phoropter to obtain a subjective examination. Ancillary tests for abnormal structures and physiology can be made via a slit lamp test, which examines the cornea, conjunctiva, anterior chamber, and iris. In severe cases of hyperopia from birth, the brain has difficulty in merging the images that each individual eye sees. This is because the images the brain receives from each eye are always blurred. A child with severe hyperopia can never see objects in detail. 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. Classification Choroid folds in high hyperopia (fluorescein angiography) Hyperopia is typically classified according to clinical appearance, its severity, or how it relates to the eye's accommodative status. Clinical classification There are three clinical categories of hyperopia. * Simple hyperopia: Occurs naturally due to biological diversity. * Pathological hyperopia: Caused by disease, trauma, or abnormal development. * Functional hyperopia: Caused by paralysis that interferes eye's ability to accommodate. Classification according to severity There are also three categories severity: * Low: Refractive error less than or equal to +2.00 diopters (D). * Moderate: Refractive error greater than +2.00 D up to +5.00 D. * High: Refractive error greater than +5.00 D. Components of hypermetropia Accommodation has significant role in hyperopia. Considering accommodative status, hyperopia can be classified as: * Total hypermetropia: It is the total amount of hyperopia which is obtained after complete relaxation of accommodation using cycloplegics like atropine. * Latent hyperopia: It is the amount of hyperopia normally corrected by ciliary tone (approximately 1 diopter). * Manifest hyperopia: It is the amount of hyperopia not corrected by ciliary tone. Manifest hyperopia is further classified into two, facultative and absolute. * Facultative hyperopia: It is the part of hyperopia corrected by patient's accommodation. * Absolute hyperopia: It is the residual part of hyperopia which causes blurring of vision for distance. So, Total hyperopia= latent hyperopia + manifest hyperopia (facultative + absolute)
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