Optical coherence tomography (OCT) is an established medical imaging technique that uses light to capture micrometer-resolution, three-dimensional images from within optical scattering media (e.g., biological tissue). More specifically OCT uses light waves to take cross-section pictures of your retina. Optical coherence tomography is based on low-coherence interferometry, typically employing near-infrared light. The use of relatively long wavelength light allows it to penetrate into the scattering medium. Confocal microscopy, another optical technique, typically penetrates less deeply into the sample but with higher resolution (ref).
We also use other examinations such as The Non-Contact Intraocular Pressure which helps measure the pressure from fluid inside the eye. This quick and simple method is the easiest intraocular pressure test for children. Patients who are at risk of glaucoma or have experienced an eye trauma or injury are most likely to be tested using this method.