Retinal Photography and Angiography
What is Retinal Photography?
Retinal (fundus) photography techniques are used to take images of the back of the eye (retina). Digital fundus cameras obtain colour images while scanning laser ophthalmoscopes use lasers of various wavelengths to create images that approximate true colour images. Using select laser wavelengths or filters allows images to be obtained that can highlight various pathologies, for example red-free photography, near-infrared imaging and autofluorescence imaging.
How is Retinal Photography performed?
Digital retinal imaging is typically performed sitting upright. After placing the chin on a chinrest the camera takes photos of the back the eye without making direct contact with the eye. An assistant may be needed to help lift the eyelids to obtain better images.
What is Retinal Photography used for?
Retinal photography is used in conjunction with retinal examination (ophthalmoscopy) whereby an ophthalmologist examines the retina using various lenses. Photography is useful to record and monitor pathology that is seen on examination.
What is Dye-Based Angiography?
Dye-based angiography is performed in the clinic in conjunction with retinal imaging to obtain images of the blood supply of the retina.
How is Dye-Based Angiography performed?
A butterfly needle or cannula is inserted into a vein on the back of the hand or in the arm. Retinal images are taken in quick succession after injection of the dye. Fluorescein dye is used to image the retinal blood vessels while indocyanine green (ICG) is used to image the choroidal blood vessels in the layer under the retina.
What is Fluorescein and ICG Dye-Based Angiography used for?
Dye-based angiography is used in the diagnosis and management of various retinal diseases. It can highlight areas of damage to the retinal blood supply in conditions such as diabetic retinopathy and retinal vein occlusion. Leakage of dye from new abnormal networks of blood vessels under the retina is seen in age-related macular degeneration. Focal leakage of dye may occur in central serous chorioretinopathy and be used to target laser therapy or photodynamic therapy. Dye-based angiography is often used on conjunction with OCT and OCT-Angiography.
What are some examples of our retinal imaging platforms?
Zeiss Visucam 224/524
The Zeiss Visucam 224 is a 24-megapixel digital fundus camera that takes true-colour images with a 45-degree view of the retina. With the use of special filters red-free and autofluorescence images can also be obtained. The Visucam 524 incorporates additional filters that allows fluorescein and ICG dye-based angiography to be performed.
Heidelberg Spectralis HRA+OCT
The Heidelberg Spectralis HRA+OCT is a modular confocal scanning laser ophthalmoscopy (cSLO) imaging system that combines multiple laser fundus imaging modalities including green, blue, infrared and multicolour imaging, autofluorescence imaging, fluorescein and indocyanine green (ICG) dye-based angiography, high-resolution spectral-domain OCT scanning and OCT angiography. Wide-field imaging is possible with up to a 55-degree view of the retina.
Optos California ultra-widefield retinal imaging system
The Optos California is an ultra-wide confocal scanning laser ophthalmoscopy imaging system that can capture a 200-degree view of the retina in a single image. It combines multiple laser fundus imaging modalities including green, infrared and multicolour imaging, autofluorescence imaging, fluorescein (FFA) and indocyanine green (ICG) dye-based angiography.
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