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19 relations: Accommodation (eye), Amplitude of accommodation, Aperture, Ciliary muscle, Corrective lens, Cycloplegia, Human eye, Miosis, Muscarinic antagonist, Muscle contraction, Negative relative accommodation, Optical aberration, Pseudomyopia, Pupil, Pupillary response, Refractive error, Topical medication, Vergence, Vision therapy.
Accommodation (eye)
Accommodation is the process by which the vertebrate eye changes optical power to maintain a clear image or focus on an object as its distance varies.
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Amplitude of accommodation
The amplitude of accommodation is the maximum potential increase in optical power that an eye can achieve in adjusting its focus.
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Aperture
In optics, an aperture is a hole or an opening through which light travels.
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Ciliary muscle
The ciliary muscle is a ring of smooth muscleSchachar, Ronald A. (2012). "Anatomy and Physiology." (Chapter 4). in the eye's middle layer (vascular layer) that controls accommodation for viewing objects at varying distances and regulates the flow of aqueous humour into Schlemm's canal. It changes the shape of the lens within the eye, not the size of the pupil which is carried out by the sphincter pupillae muscle and dilator pupillae.
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Corrective lens
A corrective lens is a lens typically worn in front of the eye to improve vision.
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Cycloplegia
Cycloplegia is paralysis of the ciliary muscle of the eye, resulting in a loss of accommodation.
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Human eye
The human eye is an organ which reacts to light and pressure.
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Miosis
Miosis is excessive constriction of the pupil.
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Muscarinic antagonist
A muscarinic receptor antagonist (MRA) is a type of anticholinergic agent that blocks the activity of the muscarinic acetylcholine receptor.
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Muscle contraction
Muscle contraction is the activation of tension-generating sites within muscle fibers.
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Negative relative accommodation
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.
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Optical aberration
Aberration in optics refers to a defect in a lens such that light is not focused to a point, but is spread out over some region of space, and hence an image formed by a lens with aberration is blurred or distorted, with the nature of the distortion depending on the type of aberration.
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Pseudomyopia
Pseudomyopia refers to an intermittent and temporary shift in refractive error of the eye towards myopia, in which the focusing of light in front of the retina is due to a transient spasm of the ciliary muscle causing an increase in the refractive power of the eye.
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Pupil
The pupil is a hole located in the center of the iris of the eye that allows light to strike the retina.
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Pupillary response
Pupillary response is a physiological response that varies the size of the pupil, via the optic and oculomotor cranial nerve.
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Refractive error
Refractive error, also known as refraction error, is a problem with focusing light accurately onto the retina due to the shape of the eye.
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Topical medication
A topical medication is a medication that is applied to a particular place on or in the body.
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Vergence
A vergence is the simultaneous movement of both eyes in opposite directions to obtain or maintain single binocular vision.
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Vision therapy
Vision therapy (also known as vision training, or VT) is used to improve vision skills such as eye movement control, eye coordination, contrast sensitivity, and perception.
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