Items tagged “eye”
82 results found
Norrie disease is a rare X-linked inherited cause of congenital bilateral blindness. It can present with a retinal mass (pseudoglioma) and cataracts. It is associated with developmental delay and hearing loss.
Subconjunctival fat prolapse
Subconjunctival fat prolapse is an acquired herniation of intraconal fat due to the weakening of the Tenon capsule by normal aging, surgery, or trauma. It presents clinically with a fat-containing epibulbar mass in the lateral canthal area. Epidemiology Subconjunctival fat prolapse occurs mai...
Diagnosis almost certain
Published 27 May 2016
Orbital plexiform neurofibromata
Diagnosis almost certain
Published 30 Aug 2016
Subperiosteal abscess of the orbit
Subperiosteal abscess of the orbit occurs as a complication of acute sinusitis. Clinical presentation Patients can present with pain, visual disturbance, proptosis and/or chemosis. Pathology Bacteria can extend via neurovascular foramina or bony dehiscences. More commonly occurs from ethmoid...
Extraconal orbital compartment
The extraconal orbital compartment or extraconal space is the space within the orbit outside the musculofascial cone. The base of which is anterior and is formed by the orbital septum that surrounds the equator of the globe. The external sides are formed by the bones of the orbit and their perio...
Myositic orbital pseudotumour
Published 27 Nov 2017
The fornix conjunctiva is loose soft tissue lying at the junction between the palpebral conjunctiva (covering the inner surface of the eyelid) and the bulbar conjunctiva (covering the globe). Each eye has two fornices, the superior and inferior fornices. The fornix permits freedom of movement of...
Senile calcific scleral plaques
Senile calcific scleral plaques, also known as senile scleral plaques (SSP), are benign scleral degenerations common in elderly individuals. They are a common incidental finding on CT imaging. Epidemiology The prevalence of SSP increases with age, from ~2.5% at age 60, to 25% at age 80 years a...
Trochlear nerve palsy
Trochlear nerve palsies, or fourth nerve palsies, result in weakness of the superior oblique muscle. Clinical presentation Vertical diplopia and ipsilateral hypertropia in the absence of ptosis, combined with a head tilt away from the affected side, are strongly suggestive of trochlear nerve p...
The conjunctiva is a transparent membrane is attached at the margins of the cornea. It is loosely attached to the sclera and thence reflected over the inner surface of the eyelids. It is firmly attached to the tarsal plates and blends with the skin at the margins of the lids. Nerve supply sup...
The tarsal plates of the eye are formed by dense fibrous tissue representing thickened extensions of the orbital septum, moulded to the curvature of the eyeball. Each eye has a superior tarsal plate and an inferior tarsal plate. The plates anchor the roots of the eyelashes and contain tarsal (...
The eyelid covers the eye and is covered in front with loose skin and behind with adherent conjunctiva. The lower lid possesses very little mobility; lids are closed gently by palpebral fibers and forcefully by orbicularis oculi. Gross anatomy The eyelid comprises of a number of key features ...
Ptosis (or blepharoptosis) is a drooping or falling of the upper eyelid. Complete ptosis is due to complete oculomotor nerve palsy. Partial ptosis is due to a dysfunction of the sympathetic pathway leading to paralysis of Muller muscle. Note that facial nerve paralysis prevents screwing of the...
Choroidal hemangiomas are benign vascular hamartomatous tumors of the choroid. They present in two forms based on the extent of choroidal involvement: Circumscribed choroidal hemangioma (CCH): solitary tumor with no systemic associations. Diffuse choroidal hemangioma (DCH): usually in associat...
Intraocular lens implant
Intraocular lens implants (IOLs) are used to replace the extracted lens as part of the standard surgical treatment for cataracts. The presence of a lens implant is known as pseudoaphakia. Structure Knowledge of the structure of an intraocular lens implant is required to ensure accurate identif...
The retina forms part of the optic pathway. It is a thin lining on the inner surface of the globe and converts light into neural signal. Arterial supply The blood supply of the retina is from two sources, supplying different portions of the organ. The integrity of the retina depends on both o...
The cornea forms the fibrous layer of the anterior portion of the eye. It functions to refract light entering the eye. Summary location: anterior one-sixth of the eyeball blood supply: avascular innervation: long ciliary nerves relations: continuous with the sclera posteriorly and covered...
The sclera is the fibrous, opaque white, coat of the eye. It functions to protect the intra-ocular contents. Summary location: posterior fifth-sixths of the eyeball blood supply: ciliary arteries innervation: ciliary nerves relations: anteriorly continuous with the cornea Gross anatomy ...
Normal crystalline lens on CT
Diagnosis not applicable
Published 05 Jan 2019