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Photopic vision

9. Februar 2017 - Eye, Ophthalmology

The photopic vision is the visual perception occurs with daytime lighting levels (at full light of day). This view allows the correct interpretation of color , by the eye .

It is based on the response of the cones , one of two types of photoreceptors of the retina (cones and rods). Cones are much less sensitive to light than sticks , so they are only activated when lighting levels are high enough.

There are three types of cones: Reds, Greens and Blues. Each of them has a photopigment with a characteristic absorption curve with respect to the wavelength that reaches them. This fact constitutes the physiological point of departure for the perception of color.

The visual acuity, that is, the perception of fine details in the images, is superior in this type of vision. First, this is due to the dense packaging of the cones in the fovea . Second, because the outputs of several adjacent rods usually converge on a single neuron, which increases sensitivity to the light intensity of this type of cells but reduces their ability to resolve details.

References

  • Wandell, Brian A. (1995). Foundations of Vision . Sunderland (Massachusetts): Sinaur Associates.