Eye conditions and diseases
People with colour vision deficiency are unable to see colours the same way that most people do.
They may have difficulty distinguishing between certain shades of colour, especially between red and green. Colour vision deficiency is often called colour blindness, but true colour blindness is rare: people with colour blindness see no colour at all, with things appearing black and white or in shades of grey.
Colour vision deficiency is more common in men than women affecting approximately 1 in 12 men and 1 in 100 women. In most cases the condition is inherited, although it can also develop as a result of injury, illness or from ageing. Colour impairment can sometimes be caused by the use of some drugs (both medicinal and illicit), alcohol or the fumes from some chemicals.
The three main types of colour vision deficiency are:
- Red-green deficiency where people cannot distinguish between certain shades of red and green.
- Blue-yellow deficiency where people cannot distinguish between blue and green. Yellow can appear as a pale grey or purple.
- Total colour blindness where no colours can be detected. People with this condition have poor sight and are very sensitive to light.
In most cases people are able to adapt to having colour vision deficiency, although some professions such as the Police and Armed Forces require recruits to have normal colour vision.
What is Diabetic Retinopathy?
Treatment & Prevention
What is Presbyopia?
Eye Muscle Control
What is Amblyopia?
What is Macular Degeneration?
What is Glaucoma?
says Andrea Kaijser, optometrist at Visique Shattky on Russell Optometrists.
Teresa Hsu, a Visique optometrist recalls a recent customer coming in saying the vision in his right eye was a bit fuzzy and his left eye was fine.
What is Pterygium?
A pterygium is a pinkish, triangular-shaped tissue growth on the cornea.
Some pterygia grow slowly throughout a person’s life, while others stop growing after a certain point. A pterygium rarely grows so big that it begins to cover the pupil of the eye.
Pterygia are more common in sunny climates and in people between 20 and 40 years of age. No one knows what causes pterygia but people with pterygia have usually spent a significant amount of time outdoors.
Treatment and Prevention
Because a pterygium is visible, many people want to have it removed for cosmetic reasons. However, it is usually not too noticeable unless irritated by dust or air pollutants.
Protective glasses, sunglasses and/or hats with brims are recommended when sunlight is strong. Your optometrist can advise on suitable UV protection for preventing or minimising pterygia and can also refer you to an ophthalmologist if necessary.
Spots and Floaters
Frequently Asked Questions
It is normal for most eyes to be long-sighted (hyperopia) at birth.This usually reduces as the eye grows to full adult size during adolescence. It is then in the teens that short-sightedness (myopia) tends to develop, if at all.
After a relatively stable time throughout the 20’s and 30’s, another significant time for change begins in the 40’s. This involves a gradual loss in the ability to finely focus the lens inside the eye. The result is a totally normal and expected change called “presbyopia", which continues into the 60’s.
After 60, the eye will tend toward less long-sightedness or more short-sightedness as the lens located in the inner part of the eye hardens. Sensitive vision drops and the retina’s fine discrimination of colours is dulled. By 70 most eyes show signs of cataracts and the older, harder, clouded eye lens scatters light so that glare often becomes more of a problem.
The eyes are our windows to the world; in fact almost 80 % of all the sensory information our brain receives comes from our eyes. So it stands to reason that looking after the health of our eyes is important throughout our lifetime Your Visique optometrist will advise you of the interval between your full eye and vision examinations that is appropriate for your vision and eye health needs. This time interval does vary for different situations, so we contact our clients when their next routine check is due. Changes in vision and eye health are often quite slow and subtle, and can easily go unnoticed if not checked regularly.
Refractive surgery describes a group of procedures where surgery is used to correct the focus of vision rather than spectacles or contact lenses. The most modern techniques use computer controlled lasers to remove a layer of the cornea (window at the front of the eye) and to reshape it to correct vision.