Kondreddy Naveen at 17:27, 30 May 2024

2024-05-30T17:27:07Z

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[[file:Cone-absorbance-en.svg|thumb|Cone-absorbance-en]]

[[file:Pupillary_light_reflex.jpg|thumb|Pupillary light reflex|left]]

'''Adaptation (eye)'''

[[File:Eyeball dissection hariadhi.svg|thumb|right|Diagram of the human eye]]

'''Adaptation (eye)''' refers to the ability of the [[eye]] to adjust to various levels of [[light]] and [[darkness]]. This process involves both [[pupil]] size adjustments and changes in the sensitivity of the [[retina]].

==Mechanisms of Adaptation==
The eye adapts to different lighting conditions through two primary mechanisms: [[pupil]] dilation and constriction, and changes in the sensitivity of the [[photoreceptor cells]] in the [[retina]].

[[file:TapetumLucidum.JPG|thumb|TapetumLucidum|left]] [[file:USS_Shiloh_operations_150306-N-LX437-237.jpg|thumb|USS Shiloh operations 150306-N-LX437-237]]

[[file:Персеїди-2021_-_екскурсія_Головної_астрономічної_обсерваторії_НАН_України_(5).jpg|thumb|Персеїди-2021 - екскурсія Головної астрономічної обсерваторії НАН України (5)]]

===Pupil Dilation and Constriction===
The [[pupil]], controlled by the [[iris]], changes size to regulate the amount of light entering the eye. In bright light, the pupil constricts (a process known as [[miosis]]), reducing the amount of light that reaches the [[retina]]. In low light, the pupil dilates (a process known as [[mydriasis]]), allowing more light to enter.

===Photoreceptor Sensitivity===
The [[retina]] contains two types of photoreceptor cells: [[rods]] and [[cones]]. [[Rods]] are more sensitive to low light levels and are primarily responsible for [[night vision]], while [[cones]] are responsible for [[color vision]] and function best in bright light.

====Dark Adaptation====
When moving from a brightly lit area to a dark one, the eye undergoes a process called [[dark adaptation]]. This involves the regeneration of [[rhodopsin]] in the [[rods]], which increases their sensitivity to low light levels. Dark adaptation can take up to 30 minutes to reach its maximum sensitivity.

[[file:Dark_Adaptation.png|thumb|Dark Adaptation]]

====Light Adaptation====
Conversely, when moving from a dark area to a brightly lit one, the eye undergoes [[light adaptation]]. This process is much quicker, taking only a few minutes. During light adaptation, the [[cones]] become more active, and the [[rods]] become less sensitive.

==Factors Affecting Adaptation==
Several factors can influence the eye's ability to adapt to different lighting conditions, including age, [[health conditions]], and exposure to certain [[medications]].

===Age===
As people age, the efficiency of both [[pupil]] response and [[photoreceptor]] sensitivity can decline, making adaptation slower and less effective.

===Health Conditions===
Certain health conditions, such as [[diabetes]] and [[retinitis pigmentosa]], can impair the eye's ability to adapt to changes in light.

===Medications===
Some medications can affect pupil size and photoreceptor sensitivity, thereby influencing the adaptation process.

==Related Pages==
* [[Eye]]
* [[Pupil]]
* [[Retina]]
* [[Rods (eye)]]
* [[Cones (eye)]]
* [[Rhodopsin]]
* [[Night vision]]
* [[Color vision]]
* [[Miosis]]
* [[Mydriasis]]

==Categories==
[[Category:Vision]]
[[Category:Ophthalmology]]
[[Category:Physiology]]

{{Ophthalmology}}
{{medicine-stub}}

Adaptation (eye) - Revision history

Kondreddy Naveen at 17:27, 30 May 2024