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Related Concept Videos

Vision01:24

Vision

Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
Color Vision01:24

Color Vision

Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.
Depth Perception and Spatial Vision01:15

Depth Perception and Spatial Vision

Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.
Blind Procedures02:07

Blind Procedures

Ideally, the people who observe and record the children’s behavior are unaware of who was assigned to the experimental or control group, in order to control for experimenter bias. Experimenter bias refers to the possibility that a researcher’s expectations might skew the results of the study. Remember, conducting an experiment requires a lot of planning, and the people involved in the research project have a vested interest in supporting their hypotheses. If the observers knew which child was...
Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...
Visual System01:26

Visual System

Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
Once through the pupil, the light passes through the lens, a...

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A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss
07:12

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[PainVision].

Jitsu Kato1

  • 1Department of Anesthesiology, Nihon University School of Medicine, Tokyo 173-8610.

Masui. the Japanese Journal of Anesthesiology
|September 29, 2011
PubMed
Summary
This summary is machine-generated.

The visual analogue scale (VAS) for pain intensity can be subjective. A new device, PainVision, offers quantitative pain assessment, potentially improving cancer pain evaluation.

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Area of Science:

  • Pain Management
  • Medical Devices
  • Oncology

Context:

  • The visual analogue scale (VAS) is a widely used but subjective tool for assessing pain intensity.
  • Patient's mental state can influence VAS pain intensity ratings.
  • Accurate pain assessment is crucial, especially in managing cancer pain.

Purpose:

  • To evaluate the utility of a newly developed device, PainVision PS-2100, for quantitative pain assessment.
  • To explore PainVision's potential as a complementary tool to the VAS for cancer pain evaluation.

Summary:

  • A novel device, PainVision PS-2100, provides a quantitative measure of pain intensity termed "degree of pain."
  • This device aims to overcome the limitations of subjective pain assessment tools like VAS.
  • Integrating PainVision with VAS may offer a more comprehensive approach to evaluating cancer pain.

Impact:

  • PainVision offers a more objective method for pain intensity measurement.
  • This quantitative approach may enhance the accuracy of pain assessment in clinical settings.
  • Improved pain assessment tools can lead to better patient outcomes in cancer care.