Above: A cross section of multiple cellular layers that make up the macula. Below: The drainage space within your eye between the cornea and the iris.
Right: Corneal thickness measurements are taken with this instrument to detect various forms of pathology and to aid in evaluation for LASIK.
Optical Coherence Tomography
Optical Coherence Tomography, or OCT for short, is a wonderful technology that allows your eye doctor to evaluate cross-sectional images of the front and back surfaces of your eyes. This works similar to ultrasound technology; however, the instrument uses light to capture the images instead of sound. From these images, your doctor will be able to see various structures with a resolution down to a few microns in size.
The procedure is similar in nature to taking a picture in that it takes a few seconds per eye. There is no pain and no flash since the light that is used is infrared and is beyond what the human eye can detect. These cross-sectional images aid your doctor in detecting diseases within the eyes earlier and monitoring certain ocular diseases such as glaucoma or age-related macular degeneration.