Postoperative Refraction
Postoperative Refraction - Related Videos
13:59
Reflection and Refraction
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2023
Source: Derek Wilson, Asantha Cooray, PhD, Department of Physics & Astronomy, School of Physical Sciences, University of California, Irvine, CA Light travels at different speeds depending on the material through which it is propagating. When light travels from one material to another, it will either slow down or speed up. In order to conserve energy and momentum, the light must change the direction in which it propagates. This bending of light is known as refraction. Some fraction of the...
01:32
Pig Surgical Preparation and Postoperative Care
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2026
All animal procedures described here must be conducted in accordance with institutional animal ethics guidelines and approved by IACUC. All procedures must follow the principles of the 3Rs—Replacement, Reduction, and Refinement—and must be performed by trained personnel. Surgical Preparation and Physiological Monitoring This video provides an introductory overview of surgical preparation, intraoperative monitoring, and postoperative care in swine. It is intended to familiarize learners with key...
09:54
Fabrication of Refractive-index-matched Devices for Biomedical Microfluidics
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Cited by 6 •
2018
This protocol describes the fabrication of microfluidic devices from MY133-V2000 to eliminate artifacts that often arise in microchannels due to the mismatching refractive indices between microchannel structures and an aqueous solution. This protocol uses an acrylic holder to compress the encapsulated device, improving adhesion both chemically and mechanically.
05:36
Subjective Refraction Test Using a Smartphone for Vision Screening
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Cited by 1 •
2024
This paper presents the protocols and clinical validation data for using a smartphone app to subjectively measure refractive error.
01:26
Influence of Earth's Curvature and Atmospheric Refraction on Leveling
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2025
During leveling, the Earth's curvature and atmospheric refraction introduce deviations in the line of sight from a true horizontal reference. When the line of sight is leveled, it remains perpendicular to the plumb line only at a single point. Beyond this, it deviates due to the Earth’s curvature, represented by the correction C. For a sight distance D, the deviation can be derived using the relationship:This relationship shows that the deviation increases quadratically with distance. Over a...
FAQs
As healing progresses, changes in corneal curvature, lens position, or ocular-surface stability can alter measured sphere, cylinder, and axis. Consequently, an early result may not represent the patient’s eventual refractive status. Assessment when healing permits helps clinicians distinguish a changing optical result from a stable residual error that can be addressed with correction or monitoring.
Objective methods, including retinoscopy or automated refraction, provide measurements of the eye’s refractive status without relying entirely on the patient’s responses. Subjective lens refinement then helps determine which correction best matches the patient’s visual experience when healing permits. Using both approaches provides a more complete basis for evaluating sphere, cylinder, and axis.
These measurements capture different aspects of the residual optical error that may remain after surgery. Changes in corneal curvature, lens position, or ocular-surface stability can affect them individually or together. Reviewing sphere, cylinder, and axis allows clinicians to characterize the refractive result more completely and determine whether optical correction or further observation is appropriate.
After surgery, the clinician assesses refractive status with an objective method such as retinoscopy or automated refraction. When healing permits, subjective lens refinement follows to clarify the most suitable correction. The findings are then considered alongside possible changes in corneal curvature, lens position, and ocular-surface stability to support prescribing, outcome evaluation, or monitoring.
Clinicians use this assessment after procedures such as cataract surgery or refractive surgery to evaluate visual outcomes and determine whether residual optical error remains. The findings can guide spectacle or contact-lens prescriptions. They also help identify results that differ from expectations, providing information for monitoring or considering further management.
An unexpected result may reflect residual optical error or a visual outcome that differs from the intended result. Healing-related changes in corneal curvature, lens position, or ocular-surface stability can also influence the measurement. Clinicians use these findings to decide whether the eye should be monitored as healing continues or whether further management is appropriate.