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  2. Photoreceptor cell - Wikipedia

    en.wikipedia.org/wiki/Photoreceptor_cell

    A photoreceptor cell is a specialized type of neuroepithelial cell found in the retina that is capable of visual phototransduction. The great biological importance of photoreceptors is that they convert light (visible electromagnetic radiation) into signals that can stimulate biological processes. To be more specific, photoreceptor proteins in ...

  3. Retinal haemorrhage - Wikipedia

    en.wikipedia.org/wiki/Retinal_haemorrhage

    Ophthalmology. Retinal hemorrhage (UK English: retinal haemorrhage) is a disorder of the eye in which bleeding occurs in the retina, the light sensitive tissue, located on the back wall of the eye. [1] There are photoreceptor cells in the retina called rods and cones, which transduce light energy into nerve signals that can be processed by the ...

  4. Cone cell - Wikipedia

    en.wikipedia.org/wiki/Cone_cell

    FMA. 67748. Anatomical terms of neuroanatomy. [ edit on Wikidata] Cone cells or cones are photoreceptor cells in the retinas of vertebrates' eyes. They respond differently to light of different wavelengths, and the combination of their responses is responsible for color vision. Cones function best in relatively bright light, called the photopic ...

  5. Raccoon eyes - Wikipedia

    en.wikipedia.org/wiki/Raccoon_eyes

    Raccoon eyes. Raccoon eyes (also known in the United Kingdom and Ireland as panda eyes) or periorbital ecchymosis is a sign of basal skull fracture or subgaleal hematoma, a craniotomy that ruptured the meninges, or (rarely) certain cancers. [1] [2] Bilateral hemorrhage occurs when damage at the time of a facial fracture tears the meninges and ...

  6. Human eye - Wikipedia

    en.wikipedia.org/wiki/Human_eye

    The human eye is an organ of the sensory nervous system that reacts to visible light and allows the use of visual information for various purposes including seeing things, keeping balance, and maintaining circadian rhythm . Arizona Eye Model. "A" is accommodation in diopters. The eye can be considered as a living optical device.

  7. Blinking - Wikipedia

    en.wikipedia.org/wiki/Blinking

    Blinking. Blinking. Blinking is a bodily function; it is a semi-autonomic rapid closing of the eyelid. [1] A single blink is determined by the forceful closing of the eyelid or inactivation of the levator palpebrae superioris and the activation of the palpebral portion of the orbicularis oculi, not the full open and close. [citation needed]

  8. Positional alcohol nystagmus - Wikipedia

    en.wikipedia.org/wiki/Positional_Alcohol_Nystagmus

    Positional alcohol nystagmus (PAN) is nystagmus (visible jerkiness in eye movement) produced when the head is placed in a sideways position.PAN occurs when the specific gravity of the membrane space of the semicircular canals in the ear differs from the specific gravity of the fluid in the canals because of the presence of alcohol.

  9. The Mote in God's Eye - Wikipedia

    en.wikipedia.org/wiki/The_Mote_in_God's_Eye

    The Mote in God's Eye is a science fiction novel by American writers Larry Niven and Jerry Pournelle, first published in 1974. The story is set in the distant future of Pournelle's CoDominium universe, and charts the first contact between humanity and an alien species.

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