In work that could improve diagnoses of many eye diseases, MIT researchers have developed a new type of laser for taking high-resolution, 3-D images of the retina, the part of the eye that converts light to electrical signals that travel to the brain. The research will be presented at the Conference on Lasers and Electro-Optics and the Quantum Electronics and Laser Science Conference in Baltimore on May 10.
A trabecular flow model for producing treatment recommendations for patients with elevated intraocular pressure is disclosed. One method includes providing intraocular pressure measurements for a patient; providing aqueous cavity information, such as collector channel resistance and Schlemm's canal resistance, and determining a treatment recommendation for the patient based on the aforementioned parameters.
Device: OCT measurements Two OCT systems from Optovue Inc. (Fremont, CA) are used to perform preoperative scanning. The first OCT system is called RTVue. It is a FDA-approved Fourier-Domain OCT system. The second OCT sytem is call ACVue. It is an experimental Time-Domain OCT system and used to measure crystalline lens thickness and anterior chamber depth. The measurements from both OCT systems are used in selecting IOL power.
We present the first demonstration of human retinal imaging in vivo using optical frequency domain imaging (OFDI) in the 800-nm range. With 460-μW incident power on the eye, the sensitivity is 91 dB at maximum and >85 dB over 2-mm depth range. The axial resolution is 13 μm in air. We acquired images of retina at 43,200 depth profiles per second and a continuous acquisition speed of 84 frames/s (512 A-lines per frame) could be maintained over more than 2 seconds.