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2. Eyelid dermatitis - Wikipedia

   en.wikipedia.org/wiki/Eyelid_dermatitis

   Eyelid dermatitis is commonly related to atopic dermatitis or allergic contact dermatitis. [1] Volatile substances, tosylamide/formaldehyde resin, epoxy hardeners, insect repellent sprays, and lemon peel oil may be implicated, with many cases of eyelid contact dermatitis being caused by substances transferred by the hands to the eyelids.

3. Keratoconus - Wikipedia

   en.wikipedia.org/wiki/Keratoconus

   In 2016, however, the FDA approved cross-linking surgery as a treatment for keratoconus and recommended that a registry system should be set-up to evaluate the long-term treatment effect. [ 9 ] [ 70 ] The Save Sight Keratoconus Registry is an international database of keratoconus patients that is tracking outcomes of cross-linking in patients ...

4. These Pictures Will Help You Identify the Most Common ... - AOL

   www.aol.com/pictures-help-identify-most-common...

   Rosacea. What it looks like: Rosacea causes redness and thick skin on the face, usually clustered in the center.Easy flushing, a stinging sensation, and small, pus-filled pimples are other common ...

5. Atopic dermatitis - Wikipedia

   en.wikipedia.org/wiki/Atopic_dermatitis

   Atopic dermatitis (AD), also known as atopic eczema, is a long-term type of inflammation of the skin. [2] Atopic dermatitis is also often called simply eczema but the same term is also used to refer to dermatitis, the larger group of skin conditions. [2] [5] Atopic dermatitis results in itchy, red, swollen, and cracked skin. [2]

6. Cone cell - Wikipedia

   en.wikipedia.org/wiki/Cone_cell

   There are about six to seven million cones in a human eye (vs ~92 million rods), with the highest concentration being towards the macula. [1] Cones are less sensitive to light than the rod cells in the retina (which support vision at low light levels), but allow the perception of color.

7. Dichromacy - Wikipedia

   en.wikipedia.org/wiki/Dichromacy

   By comparison, every color in a trichromat's gamut can be evoked with a combination of monochromatic light and white light. Dichromacy in humans is a color vision deficiency in which one of the three cone cells is absent or not functioning and color is thereby reduced to two dimensions. [1]

8. Contact dermatitis - Wikipedia

   en.wikipedia.org/wiki/Contact_dermatitis

   Psoralens are in fact used therapeutically for the treatment of psoriasis, eczema, and vitiligo. [citation needed] Photocontact dermatitis is another condition in which the distinction between forms of contact dermatitis is not clear-cut. Immunological mechanisms can also play a part, causing a response similar to ACD.

9. Psoriatic arthritis - Wikipedia

   en.wikipedia.org/wiki/Psoriatic_arthritis

   Psoriatic arthritis (PsA) is a long-term inflammatory arthritis that occurs in people affected by the autoimmune disease psoriasis. [1] [2] The classic feature of psoriatic arthritis is swelling of entire fingers and toes with a sausage-like appearance ("sausage digit"). [3]