FirstRanker Logo

FirstRanker.com - FirstRanker's Choice is a hub of Question Papers & Study Materials for B-Tech, B.E, M-Tech, MCA, M.Sc, MBBS, BDS, MBA, B.Sc, Degree, B.Sc Nursing, B-Pharmacy, D-Pharmacy, MD, Medical, Dental, Engineering students. All services of FirstRanker.com are FREE

📱

Get the MBBS Question Bank Android App

Access previous years' papers, solved question papers, notes, and more on the go!

Install From Play Store

Download MBBS Ophthalmology PPT 8 Visual Pathway Lesions Lecture Notes

Download MBBS (Bachelor of Medicine, Bachelor of Surgery) Ophthalmology PPT 8 Visual Pathway Lesions Lecture Notes

This post was last modified on 07 April 2022


Visual Pathway: Lesions

VISUAL PATHWAY ANATOMY

--- Content provided by FirstRanker.com ---


COMPONENTS OF VISUAL PATHWAY

VISUAL

--- Content provided by FirstRanker.com ---

PATHWAY




--- Content provided by FirstRanker.com ---

Anopia

?Hemianopia: Loss of vision in one half of

visual field

--- Content provided by FirstRanker.com ---




Heteronymous hemianopia

--- Content provided by FirstRanker.com ---


Quadrantanopia

Homonynous hemianopia

--- Content provided by FirstRanker.com ---

Congruous

Incongruous

eg-Optic tract &

--- Content provided by FirstRanker.com ---


LGB lesions

eg-Post optic

--- Content provided by FirstRanker.com ---

radiation lesions


inverted

--- Content provided by FirstRanker.com ---

reversed

LESIONS

OF VISUAL

--- Content provided by FirstRanker.com ---


PATHWAY



--- Content provided by FirstRanker.com ---


Field Defects in Lesions of Optic Nerve

Cause:

--- Content provided by FirstRanker.com ---

traumatic avulsion or optic atrophy

Clinical features:

?Ipsilateral anopia

--- Content provided by FirstRanker.com ---


(loss of vision)
?Loss of direct pupillary reaction

(same side)

--- Content provided by FirstRanker.com ---

?loss of consensual pupillary reaction

(other side)
?Near or accommodation reflex is

--- Content provided by FirstRanker.com ---

present

Field Defects in Lesions of Optic Chiasma

(Less common)

--- Content provided by FirstRanker.com ---


? I Ird ventricle

enlargement /

--- Content provided by FirstRanker.com ---

dilatation

? Atheroma of carotids or

posterior

--- Content provided by FirstRanker.com ---


communicating arteries



--- Content provided by FirstRanker.com ---


Pituitary Adenoma

Craniopharyngioma

--- Content provided by FirstRanker.com ---


Field Defects in Lesions of Optic Tract

left optic tract lesion
involving left cerebral

--- Content provided by FirstRanker.com ---

peduncle and left 3rd nerve.

Causes of optic tract lesion


--- Content provided by FirstRanker.com ---



Field Defects in Lesions of

Lateral geniculate Body (LGB)

--- Content provided by FirstRanker.com ---


sparing of pupillary

reflexes

--- Content provided by FirstRanker.com ---

Lesion of optic radiations

Pie in the sky

Pie on the floor

--- Content provided by FirstRanker.com ---

Common causes of lesions of optic
radiations

lesions of optic radiations-Clinical

--- Content provided by FirstRanker.com ---

presentation




--- Content provided by FirstRanker.com ---

Field Defects in Lesions of Visual Cortex

Common causes of lesions of Visual

Cortex

--- Content provided by FirstRanker.com ---

Clinical presentation in Visual Cortex

Lesions (Cortical blindness)

[Anton syndrome]

--- Content provided by FirstRanker.com ---


[Riddoch phenomenon]

[Alexia]

--- Content provided by FirstRanker.com ---

Differences between occipital lobe and

optic tract lesions

Clinical Features

--- Content provided by FirstRanker.com ---


Occipital lobe

Optic tract lesion

--- Content provided by FirstRanker.com ---

lesion

Pupillary reaction

Normal

--- Content provided by FirstRanker.com ---


Abnormal

Field defect

--- Content provided by FirstRanker.com ---

Congruous

Incongruous

Macular involvement Sparing

--- Content provided by FirstRanker.com ---


Involved

Optic atrophy

--- Content provided by FirstRanker.com ---

-

+