Optical Coherence Tomography (OCT):
The technique of optical coherence tomography (OCT) produces high resolution, high speed, non-invasive, cross-sectional images of body tissue. The technology is best compared to ultrasound, except that it employs light rather than sound and thereby achieves clearer, sharper resolution. Non-invasive OCT examinations produce real-time cross-sectional images of retinal tissue, in ophthalmic applications, and are usually accomplished in less than 10 minutes. Thanks to OCT's high resolution, which is 10 times greater than magnetic resonance imaging (MRI) or ultrasound, microscopic early signs of disruption in tissues can be detected and treated.
Is useful for evaluating various disease effects on the retina. The test requires an injectable dye (fluorescein), specialized camera with filters, and timing. The dye is injected into the patient's arm; within seconds, the dye travels to the blood vessels inside the eye. Photographs are taken to document any fluid leakage as the dye circulates through the eye. A digital camera is often used which allows the physician to interpret the results immediately.
May be ordered by your physician to document the status of the optic nerve, macula, retina, blood vessels and the vitreous. Specialized cameras are used to document the progression of diseases such as macular degeneration, glaucoma, and diabetic retinopathy.
Preferencial Hyperacuity Perimeter (PreView PHP):
For Early Detection and Monitoring of Age-related Macular Degeneration (AMD).
The PreView PHP™ is a visual field test using an artificial distortion technique. The test is based on the hyperacuity phenomenon, where a dot deviation signal is flashed across different macular loci. Distortions or scotomata are recorded and automatically analyzed, yielding a map of the macular visual field, as well as a standardized analysis. PreView PHP provides early detection, monitoring, and referral for further investigation of AMD. These are critical to prevent vision loss and to maximize treatment benefits.
Is used in ophthalmology when a cloudy cornea, a dense cataract, or blood in the vitreous obscures a view into the eye with an ophthalmoscope. Standardized ultrasound also may be used to evaluate the extent and location of a retinal detachment, to determine the exact borders and height of intraocular or orbital tumors; to determine the axial eye length (the distance from
Is used in ophthalmology when a cloudy cornea, a dense cataract, or blood in the vitreous obscures a view into the eye with an ophthalmoscope. Standardized ultrasound also may be used to evaluate the extent and location of a retinal detachment, to determine the exact borders and height of intraocular or orbital tumors; to determine the axial eye length (the distance from the outer cornea to the macula); and the thickness of extraocular muscles. B-scan ultrasound produces a two-dimensional, cross-sectional image; A-scan produces a one-dimensional view. It is appropriate to obtain an A-scan on patients before cataract surgery to determine the appropriate power of the intraocular lens implant.
Produces detailed information about the curvature of the cornea. Computer software is used to measure and analyze the surface of the cornea and generate a color map from the data.
The data is helpful to evaluate and plan to correct astigmatism, monitor corneal disease and detect irregularities in the shape of the cornea. Accurate measurement of astigmatism is important for refractive surgery, contact lens fitting and calculating the power of intraocular lenses.