Abstract
Optical coherence tomography (OCT) is a high-speed and non-contact optical imaging technology widely used for noninvasive cross-sectional imaging of biological objects. Two main OCT technologies have been developed: time domain and Fourier domain technologies. The latter can be further divided into spectral domain OCT, which uses a broadband light source and a spectrometer as a detector, and swept source OCT, which employs a quickly-rotating laser source. Advances in OCT technology have made it one of the most helpful devices in ophthalmic practice. Fourier OCT has revolutionized imaging of the posterior segment of the eye, as well as of anterior structures and has enhanced the ability to diagnose and manage patients. It provides high-resolution information about the tear film, contact lens (CL), a qualitative and quantitative assessment of the anterior eye that is important in contact lens fitting, and allows possible eye surface changes while wearing contact lenses to be monitored. Potential swept source OCT technology applications include industrial processes of lens design and quality control. In this paper, we describe clinical applications and outline a variety of multifunctional uses of OCT in the field of refractive error correction with contact lenses.
Highlights
Optical coherence tomography (OCT) is a high-speed and non-contact optical imaging procedure used for noninvasive cross-sectional imaging of biological objects
As the OCT allows for objective quantitative measurements of contact lens (CL) movement, it is thought to be a perfect complement to slit-lamp examination [53]
The first method to allow whole-lens, 3D metrology of CL based on swept source OCT (SSOCT) was reported by Karnowski et al in 2014
Summary
OCT is a high-speed and non-contact optical imaging procedure used for noninvasive cross-sectional imaging of biological objects. OCT images use light backscattered from different layers of tissue to analyze the structures of the anterior eye [1,2,3,4]. In currently available commercial SSOCT instruments, the average wavelength is usually longer than in SOCT Both SSOCT and SOCT detect A-scans in the Fourier domain and have a superior sensitivity compared to TdOCT. En face OCT offers a new view of the different layers of tissue It produces coronal sections (C-scans) oriented in a frontal plane, perpendicular to the optical axis of the eye. OCT angiography (OCTA), in turn, detects blood flow by analyzing signal decorrelation or phase deviations between ultra-high-speed scans and may be useful for examining corneal vascularization [19]
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