Design and Development of High Resolution Digitized Stereo Video Slit Lamp

2001 ◽  
Author(s):  
Randall J. Olson
Keyword(s):  
High Resolution ◽  
Slit Lamp ◽  
Design And Development ◽  
Stereo Video

Slit-Lamp–Adapted Ultra-High Resolution OCT for Imaging the Posterior Segment of the Eye

2012 ◽  
Vol 43 (1) ◽  
pp. 76-81 ◽  
Author(s):  
Hong Jiang ◽  
Fawzi Abukhalil ◽  
Meixiao Shen ◽  
Giovanni Gregori ◽  
Byron L. Lam ◽  
...  
Keyword(s):  
High Resolution ◽  
Posterior Segment ◽  
Slit Lamp ◽  
High Resolution Oct

scholarly journals Use of Fourier-Domain Optical Coherence Tomography to Evaluate Anterior Stromal Opacities in Donor Corneas

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Matthew R. Bald ◽  
Christopher Stoeger ◽  
Joshua Galloway ◽  
Maolong Tang ◽  
Jeffrey Holiman ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
High Resolution ◽  
Corneal Opacity ◽  
Fourier Domain ◽  
Optical Coherence ◽  
Slit Lamp ◽  
Eye Bank ◽  
Slit Lamp Examination ◽  
Corneal Opacities ◽  
Donor Corneas

Purpose. To evaluate Fourier-domain optical coherence tomography (FD-OCT) as an adjunct to traditional slit lamp examination of donor corneas with suspected Anterior Stromal Opacities.Methods. Seven corneas suspected of having anterior stromal opacities by slit lamp examination were evaluated with FD-OCT. Each cornea was evaluated to confirm the presence of opacity and, if present, the depth of opacity was measured.Results. The opacity depth ranged from 82 μm to 624 μm. The initial slit lamp impressions of five of the seven corneas were confirmed by OCT. In two corneas, the OCT findings were different from the initial slit lamp impressions. Slit lamp examination of the first cornea gave the impression of anterior stromal scarring, but OCT showed that the opacity was limited to the epithelium. Slit lamp examination of the second cornea suggested opacity limited to the epithelium, but OCT identified significant sub-Bowman's scarring. In all cases, the Eye Bank Technicians reported that the location and depth of corneal opacity were more sharply defined by OCT than by slit lamp.Conclusion. The high resolution of OCT makes it easier to determine the location of corneal opacities compared to slit lamp examinations. This enhanced visualization can improve decisions regarding transplant suitability of donor corneas.

scholarly journals Pre-Descemetic Placement of Intracorneal Ring Segments for Keratoconus after Mechanical Implantation

2021 ◽  
pp. 940-943
Author(s):  
Faady Yahya ◽  
Christian F. Prünte ◽  
Hendrik P.N. Scholl ◽  
Zisis Gatzioufas
Keyword(s):  
Visual Acuity ◽  
High Resolution ◽  
Femtosecond Laser ◽  
Anterior Segment ◽  
Slit Lamp ◽  
Anterior Segment Oct ◽  
Ring Segment ◽  
Intracorneal Ring Segment

We report the case of a 23-year-old male who was referred to our clinic for a routine follow-up examination. The patient was treated for keratoconus 3 years ago in Colombia, where intracorneal ring segments were implanted mechanically in both eyes to improve his visual acuity. Surprisingly, we discovered a pre-descemetic placement of intracorneal ring segments, which could lead to potential complications, under circumstances. We illustrate this impressive finding with slit-lamp photography and high-resolution anterior segment OCT and advocate for the use of femtosecond laser as the method of choice for intracorneal ring segment insertion in order to provide maximal precision and safety.

scholarly journals Multi-modal Anterior Eye Imager Combining Ultra-High Resolution OCT and Microvascular Imaging for Structural and Functional Evaluation of the Human Eye

2020 ◽  
Vol 10 (7) ◽  
pp. 2545
Author(s):  
Peng Xiao ◽  
Zhengyu Duan ◽  
Gengyuan Wang ◽  
Yuqing Deng ◽  
Qian Wang ◽  
...  
Keyword(s):  
Blood Flow ◽  
High Resolution ◽  
Imaging System ◽  
Corneal Tissue ◽  
Functional Evaluation ◽  
Movement Trajectory ◽  
Slit Lamp ◽  
Healthy Human ◽  
Vessel Network ◽  
Microvascular Imaging

To establish complementary information for the diagnosis and evaluation of ocular surface diseases, we developed a multi-modal, non-invasive optical imaging platform by combining ultra-high resolution optical coherence tomography (UHR-OCT) with a microvascular imaging system based on slit-lamp biomicroscopy. Our customized UHR-OCT module achieves an axial resolution of ≈2.9 μm in corneal tissue with a broadband light source and an A-line acquisition rate of 24 kHz with a line array CCD camera. The microvascular imaging module has a lateral resolution of 3.5 μm under maximum magnification of ≈187.5× with an imaging rate of 60 frames/s, which is sufficient to image the conjunctival vessel network and record the movement trajectory of clusters of red blood cells. By combining the imaging optical paths of different modules, our customized multi-modal anterior eye imaging platform is capable of performing real-time cross-sectional UHR-OCT imaging of the anterior eye, conjunctival vessel network imaging, high-resolution conjunctival blood flow videography, fluorescein staining and traditional slit-lamp imaging on a single device. With self-developed software, a conjunctival vessel network image and blood flow videography were further analyzed to acquire quantitative morphological and hemodynamics parameters, including vessel fractal dimensions, blood flow velocity and vessel diameters. The ability of our multi-modal anterior eye imager to provide both structural and functional information for ophthalmic clinical applications was demonstrated on a healthy human subject and a keratitis patient.

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