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Developed by Australian ophthalmologist Noel Alpins and introduced in 1993, the Alpins Method provides a coherent basis for reporting astigmatism results, and on this basis became the standard in the major ophthalmology journals, [9] [10] [11] and was accepted worldwide for studies that include refraction and corneal astigmatism measurements.
Javal's rule is a mathematical formula used to estimate astigmatism based on keratometry readings. [1] The estimate is useful for high cylinder measures, generally over -2.00 diopters. The estimate is found by multiplying the difference in power between the two meridians by 1.25 and factoring in the average lenticular astigmatism, which is -0. ...
No light perception is considered total visual impairment, or total blindness; see Visual impairment#Classification: NPC: Near point of convergence or no previous correction NRC Normal retinal correspondence NV Near vision NWT Normal wearing time o symptoms Zero symptoms ϕ Horizontal orthophoria θ Vertical orthophoria ⊕
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