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Dark circles are likely to become more noticeable and permanent with age. This is because as people get older, their skin loses collagen , becoming thinner and more translucent. As facial fat descends and fat volume decreases, the somewhat inflexible ligaments can result in orbital rim and facial hollowing. [ 2 ]
"Blue" kohl is a dark-bluish black pigment composed of lead-based compounds as well as a compound of antimony. The lead-based compounds in kohl are galena (PbS) – dark grey and gloss, laurionite (PbCl(OH)) – white, phosgenite (PbCl) 2 CO 3), and cerussite (PbCO 3) – blue. The antimony-based compound in kohl is stibnite (Sb 2 S 3) – blue.
An epicanthic fold or epicanthus [6] is a skin fold of the upper eyelid that covers the inner corner (medial canthus) of the eye. [3] However, variation occurs in the nature of this feature and the possession of "partial epicanthic folds" or "slight epicanthic folds" is noted in the relevant literature.
Periorbital hyperpigmentation, also known as hereditary dark circles, is characterized by darker skin around the eyes caused by the presence of additional melanin. It is an extremely common hereditary human characteristic and is frequently found on individuals with dark skin. Periorbital hyperpigmentation is most prevalent within the 16–25 ...
Eyelid edema is a condition in which the eyelids are swollen and tissues contain excess fluid. It may affect eye function when it increases the intraocular pressure. Eyelid edema is caused by allergy, trichiasis or infections. [4] The main symptoms are swollen red eyelids, pain, and itching. Chronic eyelid edema can lead to blepharochalasis.
of or pertaining to the cilia, the eyelashes; eyelids Latin cilium, eyelash; eyelid ciliary: circum-denoting something as 'around' another Latin circum, around circumcision: cis-on this side Latin cis: cisgender-clast: break Greek κλαστός (klastós), broken osteoclast: clostr-spindle Greek κλωστήρ (klōstḗr), spindle, thread ...
The term comes from the Latin word nictare, meaning "to blink". It is often called a third eyelid or haw, and may be referred to in scientific terminology as the plica semilunaris, membrana nictitans, or palpebra tertia. Unlike the upper and lower eyelids, the nictitating membrane moves horizontally across the eyeball.
Normally, as part of the pupillary light reflex, the pupil dilates in the dark and constricts in the light to respectively improve vividity at night and to protect the retina from sunlight damage during the day. A mydriatic pupil will remain excessively large even in a bright environment. The excitation of the radial fibres of the iris which ...