Perret Opticians
 
We have been opticians for three generations in our family, and our activity is targeted on three areas, optometry, contact lenses and optical instruments.
 
 

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Vision Abnormality Examples

Peripheral Visual Field Loss (1)

 

There are numerous problems which can cause a loss of the peripheral, or side vision. Examples given on this page include glaucoma, cerebral stroke (involving the visual system), stroke of the optic nerve (ischemic optic neuropathy), and pituitary tumour.

  • Glaucoma
    Glaucoma gradually affects the peripheral vision. Each eye is involved separately, assuming that both eyes have glaucoma. Often the inside (nasal) field of vision is affected first. Blind spots from glaucoma tend to be arc-like in shape, extending from the normal blind spot. The horizontal midline tends to be respected by blind spots from glaucoma. Sometimes the central vision itself can be cut across or eliminated.

     

  • Cerebral Stroke
    A stroke involving the visual part of the brain or the visual pathways through the brain can cause a loss of the field of vision. This appears in BOTH eyes, since one side of the brain serves the opposite field of vision for both eyes. The vertical midline tends to be respected. The degree of involvement of either eye may not be identical, and sometimes the central vision is spared.

     

  • Optic nerve stroke
    Ischemic optic neuropathy is usually a sudden lack of blood flow to the nerve in the eye. The visual field loss tends to cut straight across the vision, with a loss of vision either above or below the horizontal midline. In some cases, the visual field loss may resemble glaucoma.

     

  • Pituitary tumour
    The pituitary gland is located in a unique place in the brain: directly below a crossing point of the optic nerves from each eye (the optic chiasm). An enlarging tumour here classically can cause the outside field of vision to be lost from both eyes.

 

    Clear image

 

Glaucoma - severe visual
field loss. Only a small central island
of vision remains. The center of
the vision is cut through horizontally as well.
Stroke of optic nerve.
Horizontal cut through center of vision.
Glaucoma - severe visual
field loss. Only a small central island
of vision remains. The centre of
the vision is cut through horizontally as well.
Stroke of optic nerve.
Horizontal cut through centre of vision.
Left Eye Right Eye

A stroke involving the left part of the brain, gives an asymmetrical lost of peripheral vision. 


Left Eye


Right Eye

  Pituitary tumour causing loss of outside field of vision of both eyes (asymmetrical).

Central vision only = impossible displacement

 

 

 

 

 

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