Topcon_KR1 W Whitepaper
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Topcon_KR1 W Whitepaper - 1

KR-1W: The all-in-one visual function evaluator University François Rabelais and Bretonneau Hospital, Tours, France efractive correction without the use of spectacles is growing increasingly common. The widespread use of laserassisted in situ keratomileusis (LASIK), photorefractive keratectomy (PRK), and intraocular lenses (IOLs) illustrates just how varied and sophisticated refractive correction techniques have become. The outcomes achieved with these techniques can be exceptional when rigorous pre-, peri- and post-operative assessments of visual parameters and overall ocular health are performed. Such assessment typically involves the use of topography to evaluate corneal health and curvature, aberrometry to measure refractive error, and pupillometry to determine pupil size. Conventional practice would call for a different device per assessment performed. However, a comprehensive machine, such as the KR-1W (Topcon, Oakland, NJ) can assist in significantly reducing the time, equipment and spatial requirements associated with visual assessment. Less is more The KR-1W is a wavefront analyzer designed to perform the five most important types of visual assessment required by refractive surgery patients: topography, aberrometry, pupillometry, refractometry, and keratometry. By combining technologies specific to wavefront aberration, © 2012 Topcon Medical Systems, Inc. Figure 1: The 5-in-1 KR-1W significantly reduces the time, equipment and spatial requirements associated with visual assessment. corneal topography, and auto-refraction, the desktop sized system speeds up patient throughput while taking up significantly less space than the numerous pieces of equipment that would otherwise be required. The KR-1W is an easyto-use system, with user-friendly features, such as complete auto-alignment, onboard evaluation software, a large color touch screen, simulated visual acuity assessment, and wavefront image sequencing. Results captured by the various modes are presented as maps – including corneal, pupillometry, IOL selection, and ocular maps. This visual presentation of data assists decision making and increases the ease with which the cause of a patient’s visual complaints can be identified.

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Topcon_KR1 W Whitepaper - 2

The KR-1W in clinical practice I started using the KR-1W approximately 3 years ago, with the aim of evaluating how helpful such a system would be in the pre- and postoperative management of cataract surgery patients. This idea arose from my awareness that three key surgical steps – pupillometry, IOL selection, and IOL implantation – are all supported by the capabilities of the KR-1W. Specifically, the system permits the measurement of the types of aberration – higher order aberration (HOA) – that cannot be corrected by IOL implantation. Corneal asphericity and astigmatism are also...

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Topcon_KR1 W Whitepaper - 3

“The KR-1W is a highly relevant machine in ophthalmic practice today. Not only is it valuable in determining procedural suitability and maximizing postoperative visual outcome among refractive and cataract surgery patients, it is also useful in general ophthalmology.” patients, as a pupil diameter greater than 6.5 mm when in scotopic conditions, puts an individual at elevated risk of poor night vision after LASIK and flags them as poor LASIK candidates. Poor visual quality and blur can be troublesome for patients and their physician if the true cause is not identified. The KR-1W is designed...

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