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  2. Pupillary light reflex - Wikipedia

    en.wikipedia.org/wiki/Pupillary_light_reflex

    The pupil is the dark circular opening in the center of the iris and is where light enters the eye. By analogy with a camera, the pupil is equivalent to aperture, whereas the iris is equivalent to the diaphragm.

  3. Dry eye syndrome - Wikipedia

    en.wikipedia.org/wiki/Dry_eye_syndrome

    Dry eye syndrome, also known as keratoconjunctivitis sicca, is the condition of having dry eyes. [2] Symptoms include dryness in the eye, irritation, redness, discharge, blurred vision, and easily fatigued eyes.

  4. Astigmatism - Wikipedia

    en.wikipedia.org/wiki/Astigmatism

    With accommodation relaxed: Simple astigmatism Simple hyperopic astigmatism – first focal line is on the retina, while the second is located behind the retina.; Simple myopic astigmatism – first focal line is in front of the retina, while the second is on the retina.

  5. Parietal eye - Wikipedia

    en.wikipedia.org/wiki/Parietal_eye

    The parietal eye (very small grey oval between the regular eyes) of a juvenile bullfrog (Lithobates catesbeianus) Adult green anole (Anolis carolinensis) clearly showing the parietal eye (small grey/clear oval) at the top of its head Parietal eye of the Merrem's Madagascar swift (Oplurus cyclurus) is surrounded by a black-and-white spot on the skin, giving it the "three-eyed" appearance

  6. Kuji-in - Wikipedia

    en.wikipedia.org/wiki/Kuji-in

    In kuji kiri the vertical strokes/slashes represent the yin/in syllables, while the horizontal strokes/slashes represent the yang/yo syllables. Thus, in kuji kiri the practitioner is first making an aggressive horizontal slash representing the first syllable which is a yang/yo which represents the absolute aspect or offensive nature of the deity.