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  2. Cone cell - Wikipedia

    en.wikipedia.org/wiki/Cone_cell

    Cone cells or cones are photoreceptor cells in the retina of the vertebrate eye. Cones are active in daylight conditions and enable Photopic vision , as opposed to rod cells , which are active in dim light and enable Scotopic vision .

  3. Photoreceptor cell - Wikipedia

    en.wikipedia.org/wiki/Photoreceptor_cell

    Distribution of rods and cones along a line passing through the fovea and the blind spot of a human eye [7] Most vertebrate photoreceptors are located in the retina. The distribution of rods and cones (and classes thereof) in the retina is called the retinal mosaic. Each human retina has approximately 6 million cones and 120 million rods. [8]

  4. Layer of rods and cones - Wikipedia

    en.wikipedia.org/wiki/Layer_of_rods_and_cones

    The elements composing the layer of rods and cones (Jacob's membrane) in the retina of the eye are of two kinds, rod cells and cone cells, the former being much more numerous than the latter except in the macula lutea. Jacob's membrane is named after Irish ophthalmologist Arthur Jacob, who was the first to describe this nervous layer of the ...

  5. Keratoconus - Wikipedia

    en.wikipedia.org/wiki/Keratoconus

    Keratoconus (KC) is a disorder of the eye that results in progressive thinning of the cornea. [3] The protrusion of the cornea may result in blurry vision, double vision, nearsightedness, irregular astigmatism, [4] and light sensitivity leading to poor quality-of-life.

  6. Adaptation (eye) - Wikipedia

    en.wikipedia.org/wiki/Adaptation_(eye)

    The human eye contains three types of photoreceptors, rods, cones, and intrinsically photosensitive retinal ganglion cells (ipRGCs). Rods and cones are responsible for vision and connected to the visual cortex. ipRGCs are more connected to body clock functions and other parts of the brain but not the visual cortex.

  7. Eye - Wikipedia

    en.wikipedia.org/wiki/Eye

    An image of a house fly compound eye surface by using scanning electron microscope Anatomy of the compound eye of an insect Arthropods such as this blue bottle fly have compound eyes. A compound eye may consist of thousands of individual photoreceptor units or ommatidia (ommatidium, singular). The image perceived is a combination of inputs from ...

  8. Optics and vision - Wikipedia

    en.wikipedia.org/wiki/Optics_and_vision

    The human eye is an organ which reacts to light for several purposes. As a conscious sense organ, the eye allows vision. Rod and cone cells in the retina allow conscious light perception and vision including color differentiation and the perception of depth. The human eye can distinguish about 10 million colors. [3]

  9. Visual acuity - Wikipedia

    en.wikipedia.org/wiki/Visual_acuity

    If the optics of the eye were otherwise perfect, theoretically, acuity would be limited by pupil diffraction, which would be a diffraction-limited acuity of 0.4 minutes of arc (minarc) or 6/2.6 acuity. The smallest cone cells in the fovea have sizes corresponding to 0.4 minarc of the visual field, which also places a lower limit on acuity.