Virtual Refractor
Virtual Refractor simulates a distance and near subjective optometric refraction, using a refractor head on virtual patients. There are numerous patients, prescriptions and profiles, and the patients respond to test questions and charts based on user input.
Refraction 101: Go Forth and Refract
2019年6月12日 · Refraction is the measurement of the eye’s focusing characteristics and the determinant of a prescription. A prescription has three main components: sphere, cylinder and axis. There are also different types of refraction: Objective (streak): Using a retinoscope to measure a patient’s refraction.
EyeScholar
Walk through a refraction, step by step, to learn concepts such as establishing and maintaining the spherical equivalent, refining cylinder power and axis, and cylinder power search. Like many procedures, refraction is difficult skill to learn by reading or watching videos.
Physics Tutorial: Refraction and the Ray Model of Light
The ray nature of light is used to explain how light refracts at planar and curved surfaces; Snell's law and refraction principles are used to explain a variety of real-world phenomena; refraction principles are combined with ray diagrams to explain why lenses produce images of objects.
Refracting Tutorial - YouTube
2010年6月7日 · Please note: I have completely rewritten and redesigned this tutorial and added many new features. It is now located at https://eyescholar.com/Here's a video...
EyeScholar Features
Practice retinoscopy using a refractor instrument. Practice retinoscopy using trial lenses. Work through compensating for working distance. View your retinoscopy results to see how close you came to the patient's "true" refraction
Refraction of Light - YouTube
2020年2月2日 · This physics video tutorial provides a basic introduction into the refraction of light. It discusses the law of reflection and the law of refraction which i...
Refractometry - The Ophthalmic Technician
2019年5月28日 · A subjective refraction is the refraction that the patient likes the most. An objective refractions is the refraction that the AR thinks would be good for the patient based on the measurements made. Manifest refractometry is acquired by asking the patients which series of lenses they prefer.
Refraction - Online Tutorials Library
The present tutorial will focus on the explanation of the definition of refraction which states a redirection of a wave or the ray of light while passing from one objective medium form another. Based on the concept of physics, the tutorial will include an explanation related to the reason, for which the refraction of light is happen.
Optics and Refraction Videos - University of Iowa
2017年12月4日 · Optics and Refraction Techniques. by Mark E. Wilkinson, OD, FAAO. Introduction to Optics and Refractive Errors of the Eye. Instructional Video; Visual Acuity Testing. Instruction Video; Subjective Refraction. Instructional Video; Standard Subjective Refraction Technique pdf Instruction Sheets. Plus Cylinder Subjective Refraction, for Clinicans