Retinal imaging allows us to detect and monitor slowly developing, often sight threatening conditions such as glaucoma, macular degeneration, diabetes, hypertension and high cholesterol.
A retinal camera captures a high definition digital image of your retina. This allows a very detailed assessment of the blood vessels and optic nerve located at the back of your eye. Subtle changes in the blood vessels or the appearance of your nerve or retinal tissue can be instantly and accurately assessed.
It is important that your retinal images are stored electronically ready for comparison at your next follow up visit. In this way changes over time can be monitored very accurately.
There are two distinct types of retinal imaging:
- Normal Field (central) retinal imaging
- Ultrawide field digital retinal imaging
Normal Field (central) retinal imaging takes images of the central 40° of the retina. Normal Field retinal imaging therefore provides very high definition images of only a small area of the retina. Normal Field retinal imaging can also be done with autofluorescence.
Imaging with autofluorescence utilises specialised filters to study certain layers of the retina, providing additional information, not possible with standard retinal imaging, which helps in the diagnosis, monitoring and prognosis of retinal conditions such as macular degeneration and central serous retinopathy. Max Astri Optometrists is one of the first optometry practices able to provide this service to patients.
Ultrawide field digital retinal imaging is the latest technology in retinal imaging and allows images of up to 200° of the retina in a single image. This allows analysis of both central and peripheral retinal conditions simultaneously, enabling better diagnosis and management of retinal conditions.
Max Astri Optometrists has introduced the Optos 200TX, a wide field digital imaging device which is capable of capturing images extending out to the periphery of the retina. This allows for a much greater area of the retina to be captured in one single image, compared to traditional equipment which involves several images superimposed together to create one large image. Images are captured without any direct contact with the eye in an automated procedure.
The Optos 200TX also allows autofluorescent imaging of the entire retina not just the central retina. This is particularly useful in managing the effects of peripheral retinal disease which is often seen in patients with diabetes or with patients with peripheral retinal detachments or tears.
The Optos 200TX has been designed to operate and capture images through small pupils down to a diameter of 2 mm. This allows imaging of patients who have difficulty with pupil dilation.