Adaptation to darkness is possible because of the presence of in the periphery of your retina.

Adaptation to darkness is possible because of the presence of rods and cones in the periphery of your retina.

Adaptation to dark depend on:

•Rhodopsin regeneration,

•Size and location on the retina,

•Intensity and duration of the pre-adapting light,

•Wavelength of the threshold light.

Adaptation to darkness is possible due to the presence of rods in the periphery of the retina.

Further Explanation:

Adaptation in visual pathology, is a capability of the retina to adjust to different levels of light.

In the retina, photoreceptor cells are present which response to the different level of light.

• Cones

• Rods

Cones are present near the center of the retina. They are responsible to visualize in a high level of light. They are conical in shape and contain opsin pigment to visualize. Opsin has three different forms which are sensitive to different wavelengths and require for color vision. They have high resolution and they are more sensitive to the high intensity of light.

Rods are present in the periphery of the retina and responsible for night vision. They contain rhodopsin pigment which is sensitive to a specific wavelength. They have low resolution and achromatic vision. They are more sensitive to the low intensity of light.

Thus, in response to light photopigment rhodopsin is photobleaches. Cones and rods require the regeneration of opsin and 11-cis retinal in dark adaptation.

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Answer Details:

Grade: High School  

Subject: Biology

Chapter: Sensory Organs

Keywords:

Sensitive, wavelength, retina, eye, rods, cones, resolution, pigment, opsin, rhodopsin, light, periphery, visual psychology, photoreceptor.

the generally accepted parts of modern cell theory include: all known living things are made up of one or more cells. all living cells arise from pre-existing cells by division. the cell is the fundamental unit of structure and function in all living organisms.