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Prism dioptres. Prism correction is commonly specified in prism dioptres, a unit of angular measurement that is loosely related to the dioptre. Prism dioptres are represented by the Greek symbol delta (Δ) in superscript. A prism of power 1 Δ would produce 1 unit of displacement for an object held 100 units from the prism. [2]
Acne. What it looks like: Acne causes red, discolored bumps on the skin, along with whiteheads, blackheads, and cysts. Other symptoms to note: Acne is the most common skin condition affecting ...
Toxic epidermal necrolysis ( TEN) is a type of severe skin reaction. [2] Together with Stevens–Johnson syndrome (SJS) it forms a spectrum of disease, with TEN being more severe. [2] Early symptoms include fever and flu-like symptoms. [2] A few days later the skin begins to blister and peel forming painful raw areas. [2]
Pseudoexfoliation syndrome, often abbreviated as PEX [1] and sometimes as PES or PXS, is an aging-related systemic disease manifesting itself primarily in the eyes which is characterized by the accumulation of microscopic granular amyloid-like protein fibers. [2] Its cause is unknown, although there is speculation that there may be a genetic basis.
Rosacea is a chronic skin condition that causes redness, flushing, and small bumps on the face that may be pus-filled, swollen, tender, [and] acne-like, says Dr. Kamangar. The rash can occur ...
Pityriasis rosea. Pityriasis rosea is a type of skin rash. [2] Classically, it begins with a single red and slightly scaly area known as a "herald patch". [2] This is then followed, days to weeks later, by an eruption of many smaller scaly spots; pinkish with a red edge in people with light skin and greyish in darker skin. [4]
Frequency. ~ 1 per 100,000 people per year [3] Dermatomyositis ( DM) is a long-term inflammatory disorder which affects the skin and the muscles. [1] Its symptoms are generally a skin rash and worsening muscle weakness over time. [1] These may occur suddenly or develop over months. [1] Other symptoms may include weight loss, fever, lung ...
Darier's disease (DD) is a rare, inherited skin disorder.It is an autosomal dominant disorder discovered by French dermatologist Ferdinand-Jean Darier in 1889.. Mild forms of the disease are the most common, consisting of skin rashes that flare up under conditions such as high humidity, high stress, or tight-fitting clothes.