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In many species, the third eyelid plays an essential role in vision by supplying oxygen and nutrients to the eye via tear production. [4] Normally, the gland can turn inside-out without detachment. [3] Cherry eye results from a defect in the retinaculum which is responsible for anchoring the gland to the periorbita.
Paradoxically, turning the eye up and out uses the inferior oblique muscle, and turning it down and out uses the superior oblique. All of these six movements can be tested by drawing a large "H" in the air with a finger or other object in front of a patient's face and having them follow the tip of the finger or object with their eyes without ...
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.
Blepharospasm usually begins with occasional twitches of both eyelids, which progress over time to forceful and frequent spasms and contractions of the eyelids. In severe episodes, the patient cannot open their eyelids (apraxia), which severely limits their daily activities. Prolonged closure of the eyelids may result in functional blindness. [4]
East Asian blepharoplasty, more commonly known as double eyelid surgery, is a cosmetic procedure that reshapes the skin around the eye to create a crease in an upper eyelid that naturally lacks one. Although 70-83% of East Asian women naturally have upper eyelid creases, it is estimated that 17-30% of Chinese and Japanese women lack this ...
Endodermic evagination relates to the inner germ layers of cells of the very early embryo, from which is formed the lining of the digestive tract, of other internal organs, and of certain glands, implies the extension of a layer of body tissue to form a pouch, or the turning inside out (protrusion) of some body part or organ from its basic position, for example the para-nasal sinuses are ...
The upper or lower eyelid can be involved, and one or both eyes may be affected. When entropion occurs in both eyes, this is known as "bilateral entropion". Repeated cases of trachoma infection may cause scarring of the inner eyelid, which may cause entropion. [3] In human cases, this condition is most common to people over 60 years of age. [4]