A visual field examination is a test designed to find out how well your peripheral vision is functioning. Reading an eye chart shows how well your visual system is working in the central area but provides little information about your side vision. A visual field examination tests both your central vision and your peripheral vision by measuring the sensitivity of your visual system in various positions.
Peripheral vision is used to find objects and detect threats and is important for general orientation and balance.
Visual field defects can be caused by anything that damages or interferes with any part of the visual system. Causes of visual field defects include diseases of the retina, diseases such as glaucoma, strokes and other brain injuries. Damage to different parts of the visual system causes different types of visual field defects. This makes visual field examinations a very useful way of detecting and diagnosing many diseases.
Visual fields are tested using a computerized instrument called an automated perimeter. The computer varies the brightness of the test lights and notes whether you saw the lights and responded by pressing the button. This allows the sensitivity of the visual system at each point to be measured.
OCT stands for Ocular Coherance Tomography. This is the most advanced instrument developed to date for examination of the retina and associated structures in cross – section. It is invaluable in the diagnosis and monitoring of conditions such as glaucoma, macular disease, optic nerve anomalies and the anterior chamber.
It uses advanced optics to deliver a high resolution cross-section of the area under examination. It is a painless procedure, as there is no contact with the eye.
A corneal topographer is used to accurately map the shape of the front surface of the eye. It is used to diagnose various eye conditions such as astigmatism, keratoconus, pellucid marginal degeneration and other corneal distortions. Advanced rigid contact lenses can then be designed from the information derived from the topographer. It is also used to monitor for progression in keratoconus.
Children’s Contact Lenses
The practice specializes in all types of contact lenses, including those for babies. The conditions where a contact lens is the optimal correction for children include: aphakia (when the child is born with cataracts that need to be removed so that vision is possible), anisometropia (where the eyes are very different in focus to each other), high myopia and hypermetropia (short and long sight) and other various conditions. Ortho-K lenses can also be used in children to slow down or prevent myopia progression.
Children are candidates for contact lenses when they are old enough to be able to follow the directions for lens care.
Cosmetic Contact lenses
This does not mean “coloured” contact lenses for cosmetic change to eye colour, but lenses that are specifically hand-made to replace a damaged or disfigured eye. These can either be rigid or soft lenses.