|
|
 |
 |
 |
 |
 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| The
Optometrists Role - Helping People to See Clearly |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
An
eye exam conducted by an optometrist will determine the condition
of your eye, and the results of the test will determine the
options for improving your sight. In many cases prescription
glasses or contact lenses will be recommended, although current
research offers a range of options after the examination has
been completed. Some professionals maintain a specialist interest
such as contact lenses, geriatric vision or children's vision. |
|
|
|
|
|
|
 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
What
Does A Dispensing Optician Do?
Dispensing opticians interpret written prescriptions to determine
the specifications of lenses. They recommend spectacle frames,
lenses, and lens coatings after considering the prescription
and the customer's occupation, habits, and facial features.
Dispensing opticians measure clients' eyes, including the distance
between the centres of the pupils and the distance between the
ocular surface and the lens. For customers without prescriptions,
dispensing opticians may use a focimeter to record spectacle
measurements in order to duplicate the spectacles. They also
may obtain a customer's previous record to re-make spectacles
or contact lenses, or they may verify a prescription with the
prescribing optometrist or ophthalmologist. |
|
|
|
|
|
|
|
|
|
|
 |
|
|
|
|
|
|
|
|
|
 |
|
|
|
|
|
|
|
|
|
|
What
is Glaucoma?
Glaucoma usually comes without any warning. Glaucoma is an eye
disorder in which the fluid pressure inside the eye causes progressive
damage to parts of the optic nerve. The pressure usually increases
when there is inadequate drainage of fluid from inside the eye.
A gradual but permanent loss of vision occurs unless the condition
is treated. |
|
|
|
|
|
|
 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Presbyopia
This loss of focusing ability is called PRESBYOPIA. It is not
a disease, but a normal change which affects everyone. Presbyopia
doesn't occur suddenly. It doesn't affect distance vision. It
is a change which begins in adolescence and can not be prevented. |
|
|
|
|
|
|
 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Hyperopia
(means "longsight")
A normal eye begins to use its focussing system as an object
comes closer. A longsighted eye has to make the same focussing
effort for near work as a normal eye, but this is in addition
to the effort it makes to keep distance vision clear. |
|
|
|
|
|
|
 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Myopia
(means "short sight")
Myopia causes blurred vision. The most common problem for those
who are shortsighted is difficulty seeing distant objects clearly.
Some myopic children have never had clear distance vision and
so are not aware of what they are missing. School vision screening
will often detect myopia. Frowning and screwing up the eyes
in an effort to see better is common and this may cause headaches.
Shortsighted children will sometimes hold reading material quite
close. In their mid to late forties most people with perfect
distance vision need reading spectacles, however many people
with myopia can see close work clearly without them. |
|
|
|
|
|
|
|
|
|
|
 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Astigmatism
- Blurred Vision and Tired Eyes
Astigmatism is a very common focussing error of the eyes which
causes blur. It is caused by the shape of the eye, usually due
to the cornea's surface or occasionally due to the eye's lens
being tilted. Sometimes astigmatism can be inherited but it
often happens as a normal characteristic of growth. |
|
|
|
|
|
|
|
|
|
|
 |
|
|
|
|
|
|
|
|
|
|
|
 |
|
|
|
|
|
|
|
|
|
|
Diabetes
related Retinopathy
People with diabetes are at risk of blindness and loss of vision
because of the disease. There are at least 200,000 people with
diabetes in NZ.
Diabetes causes changes in the cells of the retina that result
in weakness in the walls of the blood vessels. These tiny blood
vessels at the back of the eye begin to bulge and leak oozing
blood into the eye. Cellular changes can cause fats and fluid
to leak into the surrounding tissues. Resulting damage to the
eyes can lead to permanent loss of vision. |
|
|
|
|
|
|
|
|
|
|
 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Cataracts
These are the result of chemical changes in the lens of the
eye and cause the clear lens to turn cloudy. Cataracts are the
leading cause of vision loss. Optometrists can assess cataract
and monitor the condition. |
|
|
|
|
|
|
 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Age
related Macular Degeneration (AMD)
AMD is the leading cause of blindness and is caused by deterioration
of cells in the macula (the part of the retina that is responsible
for clear, sharp vision). Vision that is lost as a result of
AMD cannot be restored. |
|
|
|
|
|
|
 |
|
|
|
|
|
|
|
|
 |
|
|
|
|
|
|
|
|
|
|
People
wear contact lenses for various reasons.
Contact lenses typically provide better vision than spectacles
for some visual conditions such as severe short-sightedness
[myopia], long-sightedness [hyperopia], astigmatism, corneal
distortion, or after cataract removal [aphakia].
Some people like the wider field of view provided by contact
lenses, as side vision [peripheral vision] is often blocked,
obscured or limited by spectacle frames. Contact lenses do not
fog up with changes in temperature - or from perspiration -
and they are unaffected by rain.
Many people choose contact lenses because they think glasses
make them look less attractive or they find spectacles annoying.
Sports players and people involved in vigorous activities often
find contact lenses more convenient than spectacles, especially
for water sports and contact sports. Priests, psychologists
and many others also find that contact lenses avoid the barrier
effect that spectacles may cause, thus leading to more direct
eye-contact. |
|
|
|
|
|
|
|
|
|
|
 |
|
|
|
|
|
|
|
|
|
|
|
|
|
 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
 |
|
 |
|
 |
|
 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Crawshaw
Optician and Optometrist
Crawshaw Optician and Optometrist
Crawshaw Optician and Optometrist
Crawshaw Optician and Optometrist
Crawshaw Optician and Optometrist
Crawshaw Optician and Optometrist
Crawshaw Optician and Optometrist
Crawshaw Optician and Optometrist
Crawshaw Optician and Optometrist
Crawshaw Optician and Optometrist
Crawshaw Optician and Optometrist
Crawshaw Optician and Optometrist
Crawshaw Optician and Optometrist
Crawshaw Optician and Optometrist
Crawshaw Optician and Optometrist
|
Crawshaw Optician
and Optometrist
Crawshaw Optician and Optometrist
Crawshaw Optician and Optometrist
Crawshaw Optician and Optometrist
Crawshaw Optician and Optometrist
Crawshaw Optician and Optometrist
Crawshaw Optician and Optometrist
Crawshaw Optician and Optometrist
Crawshaw Optician and Optometrist
Crawshaw Optician and Optometrist
Crawshaw Optician and Optometrist
Crawshaw Optician and Optometrist
Crawshaw Optician and Optometrist
Crawshaw Optician and Optometrist
Crawshaw Optician and Optometrist
|
Crawshaw Optician
and Optometrist
Crawshaw Optician and Optometrist
Crawshaw Optician and Optometrist
Crawshaw Optician and Optometrist
Crawshaw Optician and Optometrist
Crawshaw Optician and Optometrist
Crawshaw Optician and Optometrist
Crawshaw Optician and Optometrist
Crawshaw Optician and Optometrist
Crawshaw Optician and Optometrist
Crawshaw Optician and Optometrist
Crawshaw Optician and Optometrist
Crawshaw Optician and Optometrist
Crawshaw Optician and Optometrist
Crawshaw Optician and Optometrist
|
