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Cataract surgery after corneal refractive surgery: preoperative considerations and management.
Curr Opin Ophthalmol
January 2024
Singapore National Eye Centre, Singapore Eye Research Institute.
Purpose Of Review: Corneal refractive surgery (CRS) is one of the most popular eye procedures, with more than 40 million cases performed globally. As CRS-treated patients age and develop cataract, the number of cases that require additional preoperative considerations and management will increase around the world. Thus, we provide an up-to-date, concise overview of the considerations and outcomes of cataract surgery in eyes with previous CRS, including surface ablation, laser in-situ keratomileusis (LASIK), and small-incision lenticule extraction (SMILE).
View Article and Find Full Text PDFDeciphering the enigma of astigmatism in cataract surgery.
Indian J Ophthalmol
September 2022
Department of Ophthalmology, Narayana Nethralaya, Bengaluru, Karnataka, India.
Background: With about 87% of patients with cataracts having astigmatism, management of astigmatism in cataract surgery not only yields an improved unaided visual acuity and image quality but also higher patient satisfaction. The video will give a step-wise guide to cataract surgeons to manage astigmatism with cataracts.
Purpose: To hit the bull's eye as far as target refraction is concerned, it is necessary to understand the benefits and limitations of currently available cutting-edge technology and formulae and apply them to the cataract surgery practice.
Poor access to eye care is a major global challenge that could be ameliorated by low-cost, portable, and easy-to-use diagnostic technologies. Diffuser-based imaging has the potential to enable inexpensive, compact optical systems that can reconstruct a focused image of an object over a range of defocus errors. Here, we present a diffuser-based computational funduscope that reconstructs important clinical features of a model eye.
View Article and Find Full Text PDFLarge dynamic range autorefraction with a low-cost diffuser wavefront sensor.
Biomed Opt Express
April 2019
Department of Biomedical Engineering, Johns Hopkins University (JHU), 3400 N. Charles Street, Baltimore, MD 21218, USA.
Wavefront sensing with a thin diffuser has emerged as a potential low-cost alternative to a lenslet array for aberrometry. Here we show that displacement of caustic patterns can be tracked for estimating wavefront gradient in a diffuser wavefront sensor (DWFS), enabling large dynamic-range wavefront measurements with sufficient accuracy for eyeglass prescription measurements. We compare the dynamic range, repeatability, precision, and number of resolvable prescriptions of a DWFS to a Shack-Hartmann wavefront sensor (SHWFS) for autorefraction measurement.
View Article and Find Full Text PDFPreoperative evaluation for cataract surgery.
Curr Opin Ophthalmol
January 2019
Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.
Purpose Of Review: To provide a consolidated update regarding preoperative evaluation for cataract surgery.
Recent Findings: Visual acuity alone is a poor gauge of cataract disability. Modalities such as wave front aberrometry, lens densitometry, and light-scatter assessments can quantify optical aspects of cataract and may prove clinically useful in surgical evaluation.
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