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  2. Cherry eye - Wikipedia

    en.wikipedia.org/wiki/Cherry_eye

    Cherry eye is a disorder of the nictitating membrane (NM), also called the third eyelid, present in the eyes of dogs and cats. [1] Cherry eye is most often seen in young dogs under the age of two. [ 2 ]

  3. Nictitating membrane - Wikipedia

    en.wikipedia.org/wiki/Nictitating_membrane

    The membrane can, however, be seen clearly by gently opening the eye of the healthy animal when it is asleep, or by pushing down/applying pressure on the eyeball, which will cause it to appear. In some breeds of dogs, the nictitating membrane can be prone to prolapse of the gland of the third eyelid, resulting in a condition called cherry eye. [9]

  4. Blindness in animals - Wikipedia

    en.wikipedia.org/wiki/Blindness_in_animals

    Glaucoma can be seen in dogs, and less commonly, cats. ... to red but sensitive in ultraviolet to a color called bee purple. ... inflammation of the nictitating ...

  5. 10 interesting dog facts you've probably never heard of ...

    www.aol.com/10-interesting-dog-facts-youve...

    5. Dogs can smell cancer cells. So, as we've touched on, dogs use their sense of smell to perceive the world. Their highly developed sense of smell means that they can tap into our emotions, they ...

  6. Tapetum lucidum - Wikipedia

    en.wikipedia.org/wiki/Tapetum_lucidum

    The dark blue, teal, and gold tapetum lucidum from the eye of a cow Retina of a mongrel dog with strong tapetal reflex. The tapetum lucidum (Latin for 'bright tapestry, coverlet'; / t ə ˈ p iː t əm ˈ l uː s ɪ d əm / tə-PEE-təm LOO-sih-dəm; pl.: tapeta lucida) [1] is a layer of tissue in the eye of many vertebrates and some other animals.

  7. Canine terminology - Wikipedia

    en.wikipedia.org/wiki/Canine_terminology

    A dog's vision is actually equivalent to a human with red-green color blindness. Different breeds have different shapes of eyes. It all depends on the purpose. If a dog is a hunter, they most definitely need good eyesight. Therefore, those breeds have a wider range of vision than others.

  8. Tears - Wikipedia

    en.wikipedia.org/wiki/Tears

    Lysozyme does this by dissolving a layer in the outer coating, called peptidoglycan, of certain bacteria. It is a typical body fluid with salt content similar to blood plasma. Usually, in a 24-hour period, 0.75 to 1.1 grams (0.03–0.04-ounce avoirdupois) of tears are secreted; this rate slows with age.

  9. Harderian gland - Wikipedia

    en.wikipedia.org/wiki/Harderian_gland

    The Harderian gland is a gland found within the eye's orbit that occurs in tetrapods (reptiles, amphibians, birds and mammals) that possess a nictitating membrane. [1] The gland can be compound tubular or compound tubuloalveolar, and the fluid it secretes (mucous, serous or lipid) varies between different groups of animals.