Fourier domain or SD-OCTs are newer Tomographers which are capable of producing higher resolution images. Instead of utilizing a mechanically rigid arm with a mirror since in TD-OCT, the benchmark light is mended and the reflections generate spectral interference fringes which are captured via a Fourier domain spectrometer and a high-resolution charged-coupled device camera. The signals are recorded in parallel rather than serially and calculated electronically instead of automatically allowing for faster imaging speeds around 26,000 axial scans per second.
The rate of image acquisition is restricted to the camera frame capture speed and the monitor speed of this Fourier calculation. The reduced examination time as well as the SD-OCT’s ability to monitor eye movement decrease mistakes from eye motion and enhance repeatability of results.
The two SD-OCTs and TD-OCTs are reliable Tomographers and may be used for comparable tests. SD-OCT’s high-resolution imaging, however, enhances sensitivity and repeatability of quantified results. A custom-built, ultra-high-resolution SD-OCT can likewise be adequate to study epithelial, Bowman’s layer or endothelial conditions up to 2µm.
Comparable to TD-OCTs, SD-OCTs have been utilized LejlaVajzovic, M.D.colleagues obtained histological profiles with their SD-OCT to deal with corneal dystrophy of Bowman’s layer, spheroidal degeneration, Salzmann’s nodular degeneration, granular dystrophy, macular dystrophy, anterior basement membrane dystrophy, Meesman’s dystrophy and ocular surface squamous neoplasia.26 Tara A. McCannel, M.D., along with colleagues recorded the treatment and resolution of a conjunctival mucosa-associated lymphoid tissue.
SD-OCTs have been used to track the Progression of epithelial healing under therapeutic contact lenses following lamellar keratoplasty and epi-LASIK processes. Others have employed SD-OCTs to get intracorneal stromal ring insertions in patients with keratoconus. SD-OCTs have also been utilized to quantify dry eyes by measuring tear meniscuses.
Cross-sectional images of the tear meniscus with all the SD-OCT are magnified to more accurately estimate the number of tears in dry eye and ordinary patients.
There are many types of anterior section imaging equipment to select from, and also the abundance of information accumulated from these devices can make their clinical applications look almost infinite.
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Depending upon the clinical needs of the workplace, corneal topographers and Tomographers augment clinical biomicroscopic evaluations to not only better manage and treat patients’ anterior segment entities, but in addition, Quantitatively track their progress with time.