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Optic Nerve: Symptoms & Signs in Clinical Medicine
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OPETIC NERVE
SET BY: NOFEL SALEEM ASSWIELMEDICAL STUDENT ,ADEN UNIVERSITY THIRD YEAR 2013/2014
E-mail :166 .Nofel @gmail com @nasswiel facebook/nasswiel
Symptoms & Signs in Clinical Medicine
Anatomical points
Impressions of light >> optic nerve >> optic chiasma >> optic tracts >> lateral geniculate bodies >> optic radiation >> occipital cortex
optic tracts >> pretectal area (pupillary Reflex)
Medial parts of optic tracts (communication) between optical system & ocluomotor nuclei.
Optic paths & Surrounding structure
Examination of the optic nerve and its connection
Visual Acuity
Near vision - Reading from a book
Far vision- Snellen chart.- Ishihara charts
Snellen chart
Ishihara charts
Ophthalmoscopic Examination Retinae
Optic discs- Color.- Margin- Counter- Crescent- Distribution of veins.
- Examination of the Eye & Vision OSCE Guide
Normal optic disc
Papilloeodema
Definition ,
hydrostatic Non-inflammatory swelling.
Optic disc or nerve head.
Associated with ↑ Intracranial pressure
Papilloeodema
Causes
1. Raised Intracranial Pressure>- Space-occupying lesions- Malignant HTS.- Chronic carbon-dioxide retention.-Occlusion of :retinal veins cavernous sinus-Other cause.
Papilloeodema
Pathogenesis Subarachnoid space. Retinal vessel. Raised Pressure. The inflow & outflow
Foster kennedy syndrome
Seen in patients with frontal lobe / olfactory lobe tumors, meningiomas of olfactory groove / sphenoidal wing.
characterized by optic atrophy on the side of the tumor (direct pressure on the nerve) papilledema on the opposite side (raised ICT).
Papilloeodema
Engorgement of the veins blurring of disk margin. Disappearance of blood vessel.
Optic Neuritis Definition
- Inflammation or demyelination - At any point of the optic nerve.
Near the disc >> optic neuritis behind the eyeball(lamina cribrosa) >>
retrobulbar neuritis. Causes
- Multiple Sclerosis- Meningitis - Avitaminosis .
Optic Neuritis
Central scotoma Oedematous disc>> less swelling Red coloration of the disc Inflammatory exudates > cloudy disc
Founds Signs of Optic Neuritis
Optic Atrophy
Definition - Damage of the optic nerve.
Causes - Optic Neuritis - Papilloeodema- Trauma .- Glaucoma- Ischaemia- Familial
Optic Atrophy Pallor of the optic
disc. Loss of visual
acuity.-sever optic neuritis, vascular occlusion>> Rapid visual failure. - Other condition >> slow & progressive
1 Hypertensive
2 Diabetic
The Retinopathies
Hypertensive Retinopathy Classification
- According to - appearance. - life prognosis.
GRADE I HTR
Narrowing of the vessel
Age- related
GRADE II HTR
Marked variation of the caliber of the vessel.
Veins is kinked, the peripheral caliber is engorged
Age- related
GRADE III HTR
Addition of Flame shaped or round retinal hemorrhages & cotton wool spots, hard exudates.
GRADE IV HTR
All changes of grade 3
Addition of papilloedema
Increase hemorrhages and exudates
Diabetic Retinopathy
Definition Progressive dysfunction of the retinal blood
vessels caused by chronic hyperglycemia. DR can be a complication of diabetes type
1 or diabetes type 2. Initially, DR is asymptomatic, if not treated
though it can cause low vision and blindness.
Diabetic Retinopathysymptoms
Diabetic retinopathy is asymptomatic in early stages of the disease
As the disease progresses symptoms may include Blurred vision Floaters Fluctuating vision Distorted vision Dark areas in the vision Poor night vision Impaired color vision Partial or total loss of vision
Diabetic Retinopathy
Retina is thickly with minute red dots (micro aneurysms)
Microaneurysms
Diabetic Retinopathy
Next :larger blot & dot hemorrhages appear
Then:waxy-looking exudates with harder edges.
Microaneurysms
Hard exudates
Diabetic Retinopathy
Larger hemorrhages appear with irregular veins.
New-formed vascular plexuses .veins loops and coils(may protruded into the vitreous)
Hard exudatesNeovascularization
Blot hemorrhage
Set by :Nofel Saleem Asswiel