Subtle changes in the retina and cornea can affect the vision tremendously which is why special tests such Optical Coherence Tomography [ OCT], and Corneal Topography are needed.
Retina and Optic Nerve Optical coherence tomography (OCT)
Optical coherence tomography (OCT) is useful in diagnosing many eye conditions, including:
- Macular hole;
- Macular pucker;
- Macular edema;
- Age-related macular degeneration;
- Central serous retinopathy;
- Diabetic retinopathy;
- Preretinal membranes.
Additionally, OCT is often used to evaluate disorders of the optic nerve. The OCT exam is helpful in determining changes to the fibers of the optic nerve, such as those caused by GLAUCOMA.
is a non-invasive imaging test that uses light waves to take cross-section pictures of your retina, the light-sensitive tissue lining the back of the eye.
Normal Retinal OCT reading
Abnormal Retinal OCT Reading
Visante – Anterior Segment [front of the eye] OCT:
The Visante OCT from Zeiss (Carl Zeiss, Germany) provides excellent high-resolution images of the anterior segment of the eye. It is a noncontact instrument that captures its images quickly.
Originally, Optical coherence tomography was only a tool for analyzing the retina. Technological advances have made it a valuable tool for evaluating the front of the eye as well.
Anterior segment OCT I can be used in the:
- Evaluation of the angle in glaucoma patients;
- Evaluation of the cornea in refractive surgery patients—particularly LASIK patients;
- Measuring the anterior chamber for certain phakic intraocular lenses; and as an
- Evaluating the cornea for Ectasia
- In pre-operative evaluations for cornea procedures, such as PTK and corneal transplants.
Corneal topography, also known as photokeratoscopy or videokeratography, is a non-invasive medical imaging technique for mapping the surface curvature of the cornea, the outer structure of the eye. The corneal is responsible for 70% of the eyes focusing power. The corneal topographer corneal topography is a process for mapping the surface curvature of the cornea, similar to making a contour map of land