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The vergence-accommodation conflict can have permanent effects on eyesight. Children under the age of six are recommended to avoid 3D displays that cause VAC. [12] Meta Half Dome prototypes addressed the problem with variable focus lenses that matched focal depth to vergence stereoscopic depth. [15]
Homelessness, also known as houselessness or being unhoused or unsheltered, is the condition of lacking stable, safe, and functional housing.It includes living on the streets, moving between temporary accommodation with family or friends, living in boarding houses with no security of tenure, [1] and people who leave their homes because of civil conflict and are refugees within their country.
There were 105,237 people experiencing homelessness in Australia on census night in 2011. This equated to 1 in 200 Australians, [4] and represented an increase of 17% from the 2006 census, with the rate of homelessness increasing from 45 per 10,000 to 49 per 10,000 or an increase in population percentage terms of 0.04%.
The young human eye can change focus from distance (infinity) to as near as 6.5 cm from the eye. [32] [33] This dramatic change in focal power of the eye of approximately 15 dioptres (the reciprocal of focal length in metres) occurs as a consequence of a reduction in zonular tension induced by ciliary muscle contraction.
A spasm of accommodation (also known as a ciliary spasm, an accommodation, or accommodative spasm) is a condition in which the ciliary muscle of the eye remains in a constant state of contraction. Normal accommodation allows the eye to "accommodate" for near-vision. However, in a state of perpetual contraction, the ciliary muscle cannot relax ...
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Degenerative myopia has been reported as one of the main causes of visual impairment. [72] Pseudomyopia is the blurring of distance vision brought about by spasm of the accommodation system. [73] Nocturnal myopia: Without adequate stimulus for accurate accommodation, the accommodation system partially engages, pushing distance objects out of ...