Optic Disc Changes In Glaucoma

Specific Signs of Optic Disc Changes In Glaucoma :

• Optic disc cupping

• Large optic cup (vertical CDR 0.7 or more)

• Asymmetry of cup/disc ratio (0.2 or more)

• Progressive enlargement of optic cup

• Does not obey the “ISNT” rule

• Focal notching of rim

• Regional pallor

• Splinter hemorrhage

• Nerve fiber layer thinning.

Less specific signs of Optic Disc Changes In Glaucoma:

Lamellar dot” sign

• Nasalization of vessels

• Peripapillary crescent (Beta zone)

• Barring of circumlinear vessels

Optic Disc Changes In Glaucoma powerpoint presentations :

Glaucoma optic disc changes ( Optic Disc Changes In Glaucoma )

1.  GLAUCOMA OPTIC DISC CHANGES PRESENTED BY- PRAGATI JAIN
2. Chronic progressive optic neuropathy caused by group of ocular conditions which lead to damage of optic nerve with loss of visual function.
3. Definitions • ONH-distal portion of optic nerve,extends from retinal surface to myelinated portion of optic nerve. • Composed of the nerve fibres which originates in the Ganglionic cell layer of retina & converge upon the nerve head from all points in the fundus. • Relation between ONH and glaucoma was first described by von Graefe in 1857
4. • Physiological cup-represents partial or complete absence of axons Pallor of cup results from exposure of lamina cribrosa and lack of glial tissue in the centre • NRR-tissue b/w cup and disc margin I>S>N>T • Normal CDR is 0.3 :1 2% have CDR 0.7:1
5.  Lamina cribrosa- porous region of sclera and also a specialized extracellular matrix that consists of fenestrated sheets of connective tissue and occasional elastic fibres lined by astrocytes
6.  • Peripapillary area-RNFL seen as striations in light reflex from bundles of nerve fibres. Distribution of retinal nerve fibre- Arrangement of nerve fibres within ONH- From peripheral part of retina lie deep in retina & occupy most superficial part of OD Fibres closer to ONH lie superficial in retina.
7.  Pathogenesis of ONH changes in glaucoma • Mechanical effect-raised IOP forces lamina cribrosa backwards and squeezes nerve fibres within ,disturb axoplasmic flow • Vascular effect-ischaemic atrophy of nerve fibre
8.  ONH Signs Suggestive Of Glaucoma • Size of cup in relation to size of ONH- Small disc with deep cup Medium disc with deep cup Meduim disc with large cup Large disc with large cup
9. • Asymmetry of cups- 0.2 in both eyes suspicion.
10. Vertical enlargement of cup- Vertical CDR > horizontal CDR Loss of axons occur more in superior and inferior regions so NRR thinning at vertical polesFocal atrophy and polar notching Inferotemporal region,sometimes superotemporally Small discrete defect due to loss of neural rim tissue.

Optic Disc Changes In Glaucoma videos:

Glaucomatous optic disc 01 video ( Optic Disc Changes In Glaucoma )

EXAMINATION Optic Nerve Head and Nerve Fiber Layer Changes ( Optic Disc Changes In Glaucoma )

Optic Disc in Glaucoma ( Optic Disc Changes In Glaucoma ) – YouTube

Optic Nerve And Glaucoma ( Optic Disc Changes In Glaucoma ) – Dr. Joel Wallach – YouTube

https://www.youtube.com/watch?v=sRFnf7_gzmM

Suspicious Optic Nerve Heads and Glaucoma ( Optic Disc Changes In Glaucoma ) – YouTube

Optic Disc Changes In Glaucoma