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Balloon Eustachian tuboplasty (BET) [1] is a minimally invasive procedure for the causal treatment of Eustachian tube dysfunction (ETD), an often-chronic disorder in which the regulation of middle ear pressure and the removal of secretions are impaired. The dysfunction often causes significant discomfort in affected patients and can trigger ...
Esotropia is a form of strabismus in which one or both eyes turn inward. The condition can be constantly present, or occur intermittently, and can give the affected individual a "cross-eyed" appearance. [1] It is the opposite of exotropia and usually involves more severe axis deviation than esophoria. Esotropia is sometimes erroneously called ...
Balloon tamponade. Scheme of using the Blakemore tube. There are sphygmomanometer drains connected with esophageal port, to enable inflating the balloon with correct pressure. Balloon tamponade is the use of balloons inserted into the esophagus, stomach or uterus, and inflated to alleviate or stop refractory bleeding.
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]
A photograph of a solitary man walking along terraces in China, rust-red rivers in Alaska and a gargantuan western red cedar are among the winning images of the Earth Photo 2024 competition.
Heterophoria is an eye condition in which the directions that the eyes are pointing at rest position, when not performing binocular fusion, are not the same as each other, or, "not straight". This condition can be esophoria, where the eyes tend to cross inward in the absence of fusion; exophoria, in which they diverge; or hyperphoria, in which ...
The strength of the prism is increased until the streak of the light passes through the centre of the prism, as the strength of the prism indicates the amount of deviation present. The Maddox rod is a handheld instrument composed of red parallel plano convex cylinder lens , which refracts light rays so that a point source of light is seen as a ...
Ophthalmology. In ophthalmology, horror fusionis is a condition in which the eyes have an unsteady deviation, with the extraocular muscles performing spasm-like movements that continuously shift the eyes away from the position in which they would be directed to the same point in space, giving rise to diplopia. Even when the double vision images ...