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An example of the scintillating grid illusion. Dark dots seem to appear and disappear at intersections. The scintillating grid illusion is an optical illusion, discovered by E. and B. Lingelbach and M. Schrauf in 1994. [2] It is often considered a variation of the Hermann grid illusion but possesses different properties. [2] [3]
Cherry angioma, also called cherry hemangioma [1] or Campbell de Morgan Spot, [2] is a small bright red dome-shaped bump on the skin. [3] It ranges between 0.5 – 6 mm in diameter and usually several are present, typically on the chest and arms, and increasing in number with age.
The Hering illusion (1861): When two straight and parallel lines are presented in front of radial background (like the spokes of a bicycle), the lines appear as if they were bowed outwards. Hollow-Face illusion: The Hollow-Face illusion is an optical illusion in which the perception of a concave mask of a face appears as a normal convex face.
Visual snow: dynamic, continuous, tiny dots observed across the entire visual field at any time of the day, regardless of lighting conditions, persisting for more than three months. The dots are usually black/gray on a white background and gray/white on a black background; however, they can also be transparent, white flashing, or colored.
The ultimate release of the vitreous around the optic nerve head sometimes makes a large floater appear, usually in the shape of a ring ("Weiss ring"). [15] Posterior vitreous detachment is more common in people who: are nearsighted; have undergone cataract surgery or clear lens extraction; have had Nd:YAG laser surgery of the eye;
Formic acid, topical, is a common treatment for plantar warts, which works by being applied over a period of time, causing the body to reject the wart. [ 17 ] Fluorouracil cream, a chemotherapy agent sometimes used to treat skin cancer , can be used on particularly resistant warts, by blocking viral DNA and RNA production and repair.
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Large, pigmented, often hairy congenital nevi. They are important because melanoma may occasionally (10 to 15%) appear in them. [citation needed] Nevus of Ito and nevus of Ota: Congenital, flat brownish lesions on the face or shoulder. [20] Nevus of Ito. Mongolian spot: Congenital large, deep, bluish discoloration which generally disappears by ...