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Related Concept Videos

Vision01:24

Vision

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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.
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Line Loss01:10

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The different configurations of source-load connections include wye (star) and delta connections. The relationship between line and phase voltages and currents varies depending on the configuration. When the source is supplying power, it is transmitted through the wires to the load, and during this transmission, some power is absorbed by the wires, leading to line loss.
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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.
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Reducing Line Loss01:18

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In a three-phase circuit, line loss is an indicator of energy dissipated as heat due to the resistance of transmission lines. To address this, incorporating transformers into the system—a step-up transformer at the source and a step-down transformer at the load—is a strategic solution. Two three-phase transformers are introduced to improve this.
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Data Reporting and Recording01:24

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Reporting and recording are crucial in data documentation. The timely, thorough, and accurate documentation of facts is essential when recording patient data. Failure to record findings during an assessment or interpretation of a problem will result in loss of information and make the patient document unreliable. The reader is left with general impressions if the information is not specific. A recording is documenting data of the individual's health information in a traceable, secure, and...
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Major Losses in Pipes01:28

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When a fluid flows through a pipe, it experiences energy losses due to frictional resistance along the pipe walls, known as major losses. These energy losses result in a pressure drop, which varies based on the flow conditions — whether laminar or turbulent — and the specific physical properties of the fluid and pipe.
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Related Experiment Video

Updated: Feb 11, 2026

Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss
07:12

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Published on: April 11, 2025

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Hairpulling causing vision loss: a case report.

Sidharth Puri1, Sarah Madison Duff1, Brett Mueller1

  • 1a Department of Ophthalmology and Visual Sciences , University of Louisville , Louisville , Kentucky , USA.

Orbit (Amsterdam, Netherlands)
|May 5, 2018
PubMed
Summary
This summary is machine-generated.

Subgaleal hematoma (SGH) can rarely extend to the orbit, causing vision loss and orbital compartment syndrome. Prompt ophthalmic evaluation is crucial for patients with large SGHs.

Keywords:
Orbital hemorrhagesubgaleal hematoma

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Area of Science:

  • Ophthalmology
  • Trauma Surgery
  • Emergency Medicine

Background:

  • Subgaleal hematoma (SGH) is a collection of blood between the galea aponeurotica and the periosteum.
  • Orbital involvement secondary to SGH is a rare but serious complication of head trauma.

Observation:

  • A 13-year-old male presented with headache after trauma, initially diagnosed with a contained SGH.
  • Two days later, he developed left eye pain, proptosis, decreased visual acuity, elevated intraocular pressure, and ophthalmoplegia.

Findings:

  • Repeat imaging showed SGH enlargement with subperiosteal extension into the orbit.
  • The patient required emergent lateral canthotomy and cantholysis, followed by surgical drainage of the subperiosteal hematoma.

Implications:

  • This case highlights the potential for SGH to cause orbital compartment syndrome, even with normal coagulation.
  • Ophthalmic evaluation should be considered for patients with large SGHs to prevent vision loss.
  • Early recognition and intervention are critical for managing SGH-induced orbital complications.