OCT Scan (Optical Coherence Tomography)
An optical coherence tomography scan (OCT scan) is a critical tool for early diagnosis of macular degeneration, glaucoma, retinal detachment, and diabetic retinal disease.
An OCT eye exam is a non-invasive test that provides 3-D color-coded, cross sectional images of the retina to enable early detection and treatment of ocular disease that may develop without any noticeable symptoms.
The OCT scan uses a light (no radiation) to obtain higher resolution images of the layers of the retina and optic nerve.
The color-coded images provide a wealth of information to help your eye doctor measure the thickness of your retina and identify any optic nerve abnormalities.
The images produced by the OCT scan are also a practical tool in helping patients understand the problem they may be experiencing, as the complication can be seen clearly and in 3D on the screen.
When is an OCT scan used?
OCT scans are used for diagnosis, management or treatment of a variety of ocular conditions:
- Macular edema
- Age-related macular degeneration (AMD)
- Evaluation of macula
- Macular hole or pseudohole
- Vitreomacular traction
- Retinal assessment
- Retinal detachment
- Retinal pigment epithelium detachment
- Epiretinal membrane
- Central serous chorioretinopathy
- Optic disc edema
- Optic nerve head drusen
- Ganglion cell complex
OCT scan for anterior angle examination
The OCT scan is a useful tool in evaluating the anterior angle in patients at risk of developing glaucoma.
The anterior angle is the drainage channel for fluid inside the eye. If the drainage channel is not working properly, it can lead to an increase in eye pressure, and cause damage to the optic nerve and vision loss.
The OCT provides cross-sectional images of the anterior angle, and facilitates detection of open-angle or angle closure glaucoma, as well as narrowing of the anterior angle, which can lead to angle-closure glaucoma.
The OCT scan can also be performed in a dark room, which facilitates faster and more accurate results— especially when the position of the anterior angle in a darkened room is of utmost importance in the diagnosis of angle-closure glaucoma.