Visual pathway & its lesions

1. Visual Pathway & Its Lesions
Dr. Sara Sadiq
(MBBS, M.Phil)

3. Visual Field
• The visual field refers to the total area in which objects can be seen in
the side vision while you focus your eyes on a central point

4. Visual Fields v/s Retinal Fields
• Visual Field  describes the area in space where the object lies
• Retinal Field  describes the area that includes neural fibers of the
retina that are receiving light from some object
• They are the reversal of one another
• The nasal retinal field receives light from the temporal visual field
• The temporal retinal field receives light from the nasal visual field

7. Visual Pathway
• Optic nerve
• Optic chiasma
• Optic tracts
• Lateral geniculate bodies
• Optic radiations

13. • A 28 year old woman presents to neurologist with complaints of
progressive loss of vision affecting her both eyes. The CT scan shows a
high density space occupying lesion. The lesion produces the above
defect by compressing which of following
a) Left optic nerve
b) Optic Chiasma
c) Right visual cortex
d) Right optic tract
Ans: B

14. • Cutting which structure on the right side causes blindness in the
temporal field of the left eye and the nasal field of the right eye?
a) Optic nerve
b) Optic chiasm
c) Optic tract
d) Geniculocalcarine tract
Ans: C

15. • A 72 years old patient presented with pituitary adenoma. What will
be his ophthalmic symptoms?
a) Homonymous hemianopia
b) Bilateral hemianopia
c) Bitemporal hemianopia
d) Complete blindness
Ans: C

16. Thank You