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New view of the eye
December 13, 2001Full colour images of the back of the eye are now better than ever thanks to research published today in the Institute of Physics journal Physiological Measurement. The new technique developed by Dr Ayyakkannu Manivannan and colleagues at the University of Aberdeen uses low-power coloured lasers to give a full colour picture that ophthalmologists can use to recognise different eye diseases.
The most common way of taking a picture of the retina is to use a flash camera that needs a high light intensity to illuminate the retina. The retina is illuminated through the outer part of the dilated pupil, while the reflected light from the retina is seen through the central pupil. Unfortunately this reduces the amount of light that can be detected by a factor of 16 and limits the image quality.
Fortunately Manivannan and colleagues have overcome this problem by designing and building a SLO with three low-power lasers that pulse rapidly in sequence, rather than simultaneously. The three lasers are chopped to produce ultra-short pulses of light lasting for just twenty-two billionths of a second. A fibre optic system then combines the three pulses to produce a single three-coloured beam. Every point on the retina is exposed to pulses from the three lasers in sequence.
The new instrument uses the same amount of light as a conventional one-colour SLO, but the image formed is clearer because of the extra colour information. Twenty-five images are taken every second to avoid the image being spoilt by eye movements, making the total imaging time to be just 40 milliseconds.
"The colour information makes it easier to recognise different retinal diseases, such as those associated with diabetic eye disease, the most common cause of blindness in the working age population", said Dr Manivannan.
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