What is an Antimongoloid slant?
A condition in which the nasal corners of the palpebral fissure are higher than the temporal corners, as opposed to the typical mongoloid slant. This occurs when the lateral palpebral ligament is inserted lower than the medial palpebral ligament. It is a feature of the Treacher Collins syndrome.
What is Antimongoloid palpebral fissure?
The palpebral fissures are oriented with an antimongoloid slant, and a coloboma occupies the lower eyelid, which lacks eyelashes in its medial two thirds. The zygomatic bones are hypoplastic and absent in the full expression of the malformation. Microtia of varying degrees is associated with conductive hearing loss.
What is Upslanting palpebral fissures?
Upslanting Palpebral Fissures Definition: Upward slanting of the space between the eyelids.
What is short palpebral fissures?
Short palpebral fissure lengths (PFL) are one of three facial features that define the unique facial phenotype of fetal alcohol syndrome (FAS). Published PFL growth charts vary greatly in both rate and magnitude of growth, placing their accuracy and validity in question.
What is a Palpebral slant?
The palpebral slant is the direction of the slant of a line that goes from the outer corner of the eye to the inner corner. The direction of the slant of a line drawn from the outer corner of the eye to the inner corner is known as the palpebral slant.
What do you mean by slant?
1 : to take a diagonal course, direction, or path. 2 : to turn or incline from a right line or a level : slope. transitive verb. 1 : to give an oblique or sloping direction to.
What causes Downslanting palpebral fissures?
The chromosomal conditions trisomy 9 and trisomy 21 (Down syndrome) can cause the palpebral fissures to be upslanted, whereas Marfan syndrome can cause a downslant. An increase in vertical height can be seen in genetic disorders such as cri-du-chat syndrome.
What does Lagophthalmos mean?
Lagophthalmos describes the incomplete or abnormal closure of the eyelids. A full eyelid closure with a normal blink reflex is necessary for the maintenance of a stable tear film and healthy ocular surface.
What genetic disorders cause Palpebral slant?
General Discussion. Pallister W syndrome is a rare genetic disorder characterized by unusual facial features such as clefting of the palate and the upper lip, a broad flat nose, widely spaced slanted eyes, and/or downslanting eyelid folds (palpebral fissures).
What do downward slanted eyes mean?
Slanting and a fold of skin (epicanthal fold) are normal in people of Asian descent. Abnormal slanting of the eye may occur with some genetic disorders and syndromes. The most common of these is Down syndrome. People with Down syndrome often also have an epicanthal fold in the inner corner of the eye.
What are features of fetal alcohol syndrome?
FASD Diagnoses People with FAS have central nervous system (CNS) problems, minor facial features, and growth problems. People with FAS can have problems with learning, memory, attention span, communication, vision, or hearing. They might have a mix of these problems.
What is the Mongolian slant?
A mongoloid slant describes the inwards downwards slant of the eyes, seen in conjunction with Down’s syndrome, but also seen in many other conditions such as Noonan’s syndrome.
Why do Down syndrome have slanted eyes?
Which is an example of slant?
The definition of a slant is an incline or a point of view. An example of a slant is an upward slope. An example of a slant is a conservative editorial approach in a newspaper. To give a direction other than perpendicular or horizontal to; make diagonal; cause to slope.
What does slant height mean?
Definition of slant height 1 : the length of an element of a right circular cone. 2 : the altitude of a side of a regular pyramid.
What syndrome causes slanted eyes?
The direction of the slant of a line drawn from the outer corner of the eye to the inner corner is known as the palpebral slant. The most commonly recognized syndrome associated with an abnormal palpebral slant is Down syndrome.
What does Blepharophimosis mean?
Blepharophimosis syndrome (BPES) is an autosomal dominant disorder of craniofacial development, the features of which are small palpebral fissures (blepharophimosis), drooping eyelids (ptosis) and a skin fold arising from the lower eyelid (epicanthus inversus).
What causes lagophthalmos?
The main cause of lagophthalmos is facial nerve paralysis (paralytic lagophthalmos), but it also occurs after trauma or surgery (cicatricial lagophthalmos) or during sleep (nocturnal lagophthalmos).
How do you check for lagophthalmos?
The degree of lagophthalmos can be measured by asking the patient to close their eyes and checking if there is a space between the upper and lower eyelid margins.