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Diagnostic Tests Quick List


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Diagnostic Tests

Your doctor may recommend additional diagnostic procedures to be undertaken on specialised equipment. These may include:

Humphrey Visual Field test

This is a test for your side vision. Many different eye conditions, such as glaucoma and optic neuritis can affect your peripheral vision as well as your central vision. Field tests reveal if there is any loss of side vision which is often not detected because we normally use our central vision. It is common to have to repeat visual field tests on a regular basis to check if there has been any change. Field tests take approximately 30 minutes to complete.


This is a test to measure the thickness of the cornea (the front surface of your eye). It is important for diagnosis of glaucoma as it helps us to predict the ideal pressure for your eye.

Ascan (Ultra-sound)

This is the measurement of the length of your eye, usually prior to Cataract surgery. It uses ultrasound waves to measure the length of your eye and the different structures within it and is an integral part in deciding the new lens that will be inserted into your eye.

Fundal Photography

It is quite common for your Ophthalmologist to want photos of the back of your eye. Often, one of the Orthoptists (or assistants) will do this. The photographs help your doctor to monitor the back of your eye and the different structures within it, so that they compare the photo with your eye at your next visit. The photo will often show your optic disc and your macula, two important structures at the back of your eye – feel free to ask questions about what you see in the photo.


Optical Coherence Tomography is the one of the latest technologies that takes a topographical map of the back of your eye using laser scanning techniques. Depending on the area that your Ophthalmologist wishes to concentrate on, the test can look at your macula, optic disc or general retina. An OCT scan can monitor changes in macula degeneration, macula hole, and the nerve fibre layer that is effected in conditions such as glaucoma.

Fluorescein Angiograms

A fluorescein angiogram is a yellow dye test used to detect changes and abnormalities in the retina. The dye is injected into your arm and once in the blood stream is able to be photographed in the vessels that are in the back of your eye. Fluorescein Angiograms are used in conditions such as diabetic retinopathy and macula degeneration.

Minor Ops

At MetWest Eye Centre we have a dedicated Minor Procedure room which is used for procedures such as chalazion removal, probing of tear ducts, removal of sutures and some excisions. Your Ophthalmologist will decide whether or not your individual condition is suitable for treatment in the Minor Procedure room or requires the use of our dedicated onsite Day Surgery.

Yag Capsulotomy

After lens insertion during cataract surgery, the new lens that has been inserted into your eye can have a membrane that can slowly reduce your vision. This is not another cataract that requires surgery. The membrane can be taken away with laser – a painless procedure that does not usually need to be repeated.


A B-scan is an ultrasound of your eye and its contents. It can be helpful in the diagnosis of conditions such as retinal detachment, and in the monitoring of some changes in the eye. Your eye is closed during the b-scan, and the doctor scans through your eyelid to look at the inside of your eye.

Frequently Asked Questions

Please visit our FAQ page for Frequently Asked Questions on treatments, conditions and general enquiries.