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OPHTHALMOBYTES

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A Virtual Ophthalmology Atlas!

 
 




VOGT’S STRIAE IN KERATOCONUS⁣⁣

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Vogt's striae are vertical stress lines in the posterior stroma and Descemet's membrane found in patients with keratoconus. ⁣⁣

They occur due to mechanical stresses on collagen lamellae radiating from the cone apex. ⁣

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The lines are parallel to the axis of the cone. ⁣⁣

The striae DISAPPEAR with external pressure to the globe. ⁣⁣

Image from Rajan Eye Care Hospital⁣

#ophthalmology #ophthal #ophthalmobytes #cornea #keratoconus




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Horseshoe tears are full thickness breaks in the neurosensory retina that occur due to vitreous traction during posterior vitreous detachment and can lead to rhegmatogenous retinal detachment.⁣

They present as a flap of retinal tissue with a detached apex which always points to the posterior pole and a base attached to the retina.⁣

When there is vitreous traction and a subsequent retinal tear, the tear is attached to the vitreous as it continues to detach. The vitreous detaches in the same direction from posterior to anterior. So when the vitreous detachment hits the base of the U or V tear, it will always tear towards the ora (anteriorly). So the ‘horseshoe’ always points to the posterior pole. ⁣

Floaters occur due to vitreous debris (thickened hyaloid membrane, a Weiss ring, hemorrhage, or retinal pigment epithelium cells)⁣

Flashes of light occur due to persistent vitreous traction⁣

For treatment of retinal breaks, AAO practice patterns can be followed (Swipe to the last picture)⁣

Image from Rajan Eye Care Hospital #ophthalmology #ophthal #retina #retinaltear




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SHIELD ULCER⁣

Severe forms of Vernal Keratoconjunctivitis can present with corneal manifestations which start as punctate epithelial erosions followed by macro erosions which coalesce into shield ulcers ⁣

They are characteristically present in the superior cornea (suggestive of a mechanical cause due to the large papillae) and can be sight threatening.⁣

Simple scraping of base and margins of the ulcer with removal of the inflammatory plaque like material will promote re-epithelialisation. ⁣

Image from Rajan Eye Care Hospital⁣

#ophthalmology #cornea #ophthalmobytes #ophthal

Image from Rajan Eye Care Hospital.


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