retina is found in the back of the eye where it functions
in the same way as film in a camera. As light enters the
eye, it is focused on the retina and this visual information
is then sent directly from the retina to the brain so you
can see images.
retina has blood vessels that supply it with oxygen and
these blood vessels can be seen by your optometrist when
looking into your eye. This window into your circulatory
system allows the doctor to diagnose and manage conditions
such as diabetes, high blood pressure, retinal detachments,
glaucoma and macular degeneration.
have always been able to look at the retina and its blood
vessels, but now technology has made it possible to capture
the image with a digital camera. This allows the image to
be stored or printed so that accurate comparisons can be
made to identify changes over time.
degeneration is the leading cause of irreversible vision
loss in North America’s over the age of 60. Macular
degeneration does not cause total blindness because side
vision is still functional. Central vision that is lost
to macular degeneration cannot be restored. There are two
forms of macular degeneration, the dry form and the wet
form. The dry form accounts for approximately 90% of the
cases. Fortunately the dry form usually causes less vision
loss, but unfortunately there is no treatment currently
available. The less prevalent wet form can lead to more
significant vision loss but its progression may be stopped
by injections if it is diagnosed and treated very early.
is group of eye diseases in which the pressure in the eye
causes vision loss. Pressure damages the optic nerve, initially
causing blind spots at the outer edges of the visual field.
If not treated, the pressure can eventually lead to loss
of all vision. Glaucoma is typically associated with a painless,
progressive loss of vision that is not noticed by the patient.
Fortunately, we now have ways to treat glaucoma. We are
not able to cure the disease or return vision that has already
been lost, but with treatment it is usually possible to
slow or stop the vision loss from progressing.
choroidal nevus is a freckle that occurs in the layer below
the retina (the choroid). It can occur in up to 30% of people.
Like freckles on your skin, in most cases they cause no
problems. It is prudent, however, to photograph the choroidal
nevus and to monitor for any changes. Monitoring is usually
done at 3 months and if there is no change, then at routine
of central vision due to a baseball injury at age 21. Patient
was 52 years of age when photograph was taken.
Papilledema caused by a Brain Tumour
77 years of age when photo was taken.