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Negative relative accommodation (NRA) was proposed by Joseph Kearney of Oxford University in 1967 as a measure of the maximum ability to relax accommodation while maintaining clear, single binocular vision. It is an indirect measurement of fusional vergence in binocular vision. [1]
The increased equatorial zonular tension keeps the lens stable and flattens the peripheral lens surface during accommodation. As a consequence, gravity does not affect the amplitude of accommodation and primary spherical aberration shifts in the negative direction during accommodation. [42] [43] The theory has not found much independent support.
Light from a single point of a distant object and light from a single point of a near object being brought to a focus. The accommodation reflex (or accommodation-convergence reflex) is a reflex action of the eye, in response to focusing on a near object, then looking at a distant object (and vice versa), comprising coordinated changes in vergence, lens shape (accommodation) and pupil size.
Like speech accommodation theory, communication accommodation theory continues to draw from social psychology, particularly from four main socio-psychology theories: similarity-attraction, social exchange, causal attribution and intergroup distinctiveness. These theories help to explain why speakers seek to converge or diverge from the language ...
Vergence-accommodation conflict can be quantified; typically, by comparing the optical power required to focus on objects at the vergence distance with the optical power required to focus on objects at the accommodation distance. [8] In this context, optical power is equal to the reciprocal of distance, with units of Diopter (m −1). Hence the ...
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Sleep has been shown to have a long list of physical and mental health benefits, and now a new study suggests it could also help to “erase" bad memories. Experts comment on the findings.
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 ...