People often experience changes in their vision when they reach their 40s. Early signs of eye conditions and more serious problems can be detected by using an OCT device that takes a detailed 3D image below the surface of the retina, giving a more detailed picture of one’s eye health.
The Optical Coherence Tomography is one of the few devices that reveals in-depth images of the eye’s internal structures. The exam only takes a few seconds, and nothing touches your eyes as you look into the machine; there are no puffs of air or flashes of bright light. Eye drops are used to make your pupils larger.
Here is a quick overview of the sophistication and value of OCT
- OCT is the most valuable advance in retinal diagnostic imaging since the introduction of fluorescein angiography in 1959.
- OCT is a non-invasive imaging technique relying on low coherence interferometry to generate in vivo, cross-sectional imagery of ocular tissues.
- Cross-sectional visualsation is an extremely powerful tool in the identification and assessment of retina abnormalities. The ability to perform volumetric and retinal thickness analysis also provides a quantitative and repeatable method to evaluate surgical and pharmacological interventions.
- OCT is also quite useful in the assessment of sub retinal fluid, neurosensory detachments, pigment-epithelial detachments, and choroidal neovascular membranes.
- How it works: – Optical Coherence Tomography generates cross sectional images by analyzing the time delay and magnitude change of low coherence light as it is backscattered by ocular tissues.
- The resulting change in signal amplitude allows tissue differentiation by analysis of the reflective properties, which are matched to a false color scale. As the scanning beam moves across tissue, the sequential longitudinal signals, or A-scans, can be reassembled into a transverse scan yielding cross-sectional images, or B-scans, of the subject. The scans can then be analyzed in a variety of ways providing both empirical measurements (e.g. RNFL or retinal thickness/volume) and qualitative morphological information.
- Three-dimensional visualizations are some of the most significant advances in this generation of OCT evolution. Once cube data has been obtained, it can be rendered in a number of ways. Sophisticated algorithms have been created to identify the major layers of the retina based on interface echo characteristics so that various segments of the retina can be “peeled” away allowing for z-plane viewing for more than just the ILM surface. Manual controls can also be utilized to rotate the cube and pull back any number of individual or combined X and Y scans so that morphology can be examined in the exact context of the retinal 3D matrix.
At Insight Optometrists, our Optometrists will discuss the results with you, and keep your details on file to refer back to at your next eye examination, as well as to check for any changes we would need to monitor, or treat.
Please contact us for further information, or to make an appointment.