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Amblyopia

What is amblyopia?
Amblyopia, sometimes known as “lazy eye”, is poor vision in an eye that did not develop normal sight during early childhood.

The best time to correct amblyopia is during infancy and early childhood or poor vision will be permanent. Parents must be aware of this potential problem if they wish to protect their child’s vision.

Amblyopia usually only affects one eye, and is often due to poor focusing or a turned eye (a squint or strabismus). Rarely it may be due to cloudiness of the normally clear eye tissues.
It is common affecting 2-3 out of 100 people.

How is it detected?
It is not easy to recognise amblyopia. Young children with poor vision are unaware of the problem. Unless a child has a misaligned or turned eye, or other obvious abnormality, there is often no way for the parents to tell that something is wrong.

Amblyopia is detected through community vision screening and surveillance programs. Children with a family history of a turned eye, or a serious congenital eye condition such as a congenital cataract may be referred to be seen by a medical eye doctor (an Ophthalmologist).

How does normal vision develop?
Newborn infants are able to see, but as they use their eyes during the first months of life vision quickly improves. During early childhood the visual system continues to develop. By the age of 7-8 years, the visual system is fully developed and the nerve pathways cannot be changed.

The development of good vision in both eyes and straight eyes is necessary for normal vision. Some occupations are not open to people who have good vision in one eye only. If the vision in one eye should be lost later in life from an accident or eye disease, it is essential that the other eye has good vision.

When should vision be tested and who does it?
The Well Child-Tamariki Ora makes the following recommendations:

All newborns should have their eyes examined by 6 weeks of age to look for rare but important congenital eye abnormalities such as cataract. This should be undertaken by the lead maternity carer, or be part of the 6 week medical check at the family doctors.

During early childhood, the child’s visual development may be assessed by a Well Child Provider Registered Nurse such as Plunket Nurse, or by your Family Doctor.
It is recommended that all children have their vision checked by the age of 4 years.
A National Vision Screening Programme is delivered by Vision Hearing Technicians (VHT) in most parts of New Zealand at this time for pre-school children and new entrant children.
Plunket also undertakes pre-school vision testing.
Pre-school testing is not universally available through VHT in Auckland.
Free Pre-school testing is available in South Auckland through an independent Government funded Pre-school Vision Screening Programme. It is available for all children attending early childcare centres, and also available at other community venues.

How is amblyopia diagnosed?
Poor vision does not always mean that a child has amblyopia. Some focusing problems which may need glasses to correct, do not cause amblyopia.

The Ophthalmologist will use a variety of tests to measure vision. Drops will be used to dilate the child’s pupils and temporarily stop their focusing in order that the need for glasses can be assessed. The inside of the eye will also be carefully examined to look for other causes of poor vision.

How is amblyopia treated?
Glasses may be prescribed to correct errors in focusing, and to help straighten a squinting eye. If glasses alone do not improve vision then eye patching is necessary. The better seeing eye is patched or covered for a period of time each day, often for weeks or months. Occasionally, amblyopia is treated by blurring the vision in the good eye with special drops to force the child to use the amblyopic eye. Part time patching treatment may need to occur until 8 years of age. After this age amblyopia usually does not return.

Does the treatment work?
Success mainly depends upon:
Carrying out the treatment of wearing glasses and eye patches. Your interest and involvement is very important as children don’t like having their eyes patched.
How old the child is when treatment is begun.
How severe the amblyopia is.

Is there financial help for purchasing the glasses?
There is a Government subsidy available to assist children from low-income families with vision problems (Community Service Card, High Health Use Card). The subsidy is available to children under 8 years of age.
The child is entitled to a maximum of $281.25 inc GST per year.
An Optometrist or Ophthalmologist determines entitlement.

Useful Contacts:
Royal New Zealand Plunket Society 0800933922 (White pages PLUNKET SOCIETY)
Community Public Health Nurse Offices (see White pages)
South Auckland Vision Screening Programme ( Clendon , Manurewa. Tel 2684590)
Spectacle Subsidy (Enable New Zealand 0800ENABLE (362253) enable@enable.co.nz