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Related Concept Videos

Anatomical Positions01:11

Anatomical Positions

In anatomy, several standard anatomical positions are used as references for describing the position and orientation of different body parts. These positions help provide a common frame of reference when discussing anatomical structures. The anatomical position is the standard reference point for describing the body's position and orientation. In this position:
The body is upright, facing forward, and standing erect.
The feet are parallel and flat on the floor.
The arms are hanging by the...
Chair Conformation of Cyclohexane02:02

Chair Conformation of Cyclohexane

The chair conformation is the most stable form of cyclohexane due to the absence of angle and torsional strain. The absence of angle strain is a result of cyclohexane’s bond angle being very close to the ideal tetrahedral bond angle of 109.5° in its chair conformer. Similarly, the torsional strain is also absent owing to the perfectly staggered arrangement of bonds.
The hydrogen atoms linked to carbons are arranged in two different axial and equatorial orientations to achieve this staggered...
Couple01:29

Couple

A couple is a pair of parallel forces equal in magnitude but in opposite directions. The forces are separated by a perpendicular distance, known as the couple's arm. The couple causes a rotation force or moment that rotates the body about an axis perpendicular to the plane of the forces. The resulting moment is referred to as the couple moment. The SI unit of a couple moment is the Newton-meter (N-m).
A typical example to understand this concept is tightening a bolt with a lug wrench. A force...
Equivalent Couples01:28

Equivalent Couples

In mechanical engineering, the concept of equivalent couples plays a crucial role in understanding and analyzing various mechanical systems.
Two couples are considered to be equivalent if they produce the same rotational effect on a rigid body. In other words, the two couples have the same magnitude and act in the same direction, causing the same angular displacement or acceleration in the body.
For instance, consider two couples lying in the plane of the page, with one having a pair of equal...
Couples Therapy01:26

Couples Therapy

Couples therapy is a therapeutic approach designed to help individuals in intimate relationships address conflicts, improve communication, and foster healthier dynamics. It is appropriate for couples at various stages, including those who are dating, married, or in long-term partnerships, and aims to support partners in navigating their unique relational challenges.
Core Principles and Techniques
Couples therapy often incorporates cognitive-behavioral principles to identify and modify negative...
Work of a Couple Moment01:12

Work of a Couple Moment

Mechanical engineering involves the study of motion, energy, and force, and is concerned with designing, manufacturing, and maintaining mechanical systems. One important concept in this field is the couple moment, produced by two equal and opposite forces acting at two points in a rigid body separated by a certain distance.
When the rigid body undergoes a differential displacement due to a couple, its motion can be divided into two parts: equal translation of the two points to their final...

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Related Experiment Video

Updated: Jun 1, 2026

Positron Emission Tomography-based Dose Painting Radiation Therapy in a Glioblastoma Rat Model using the Small Animal Radiation Research Platform
07:57

Positron Emission Tomography-based Dose Painting Radiation Therapy in a Glioblastoma Rat Model using the Small Animal Radiation Research Platform

Published on: March 24, 2022

[Couching then and now].

Leonard P Bokhorst1, Richard H C Zegers

  • 1Diakonessenhuis, afd. Oogheelkunde, Zeist, the Netherlands. leonardbokhorst@gmail.com

Nederlands Tijdschrift Voor Geneeskunde
|June 9, 2011
PubMed
Summary
This summary is machine-generated.

Cataract surgery has evolved significantly, from ancient 'couching' techniques to modern lens extraction. While couching is still used in parts of Africa and Asia, lens extraction is preferred globally due to better outcomes.

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Assessment of the Efficacy of An Osteopathic Treatment in Infants with Biomechanical Impairments to Suckling
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Assessment of the Efficacy of An Osteopathic Treatment in Infants with Biomechanical Impairments to Suckling

Published on: February 5, 2019

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Positron Emission Tomography-based Dose Painting Radiation Therapy in a Glioblastoma Rat Model using the Small Animal Radiation Research Platform
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Positron Emission Tomography-based Dose Painting Radiation Therapy in a Glioblastoma Rat Model using the Small Animal Radiation Research Platform

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Assessment of the Efficacy of An Osteopathic Treatment in Infants with Biomechanical Impairments to Suckling
07:11

Assessment of the Efficacy of An Osteopathic Treatment in Infants with Biomechanical Impairments to Suckling

Published on: February 5, 2019

Area of Science:

  • Ophthalmology
  • Surgical History
  • Global Health

Context:

  • Cataracts represent the leading cause of reversible blindness globally.
  • Historical surgical interventions for cataracts date back over 3,000 years.
  • The evolution of cataract surgery reflects advancements in medical understanding and technology.

Purpose:

  • To trace the historical development of cataract surgical procedures.
  • To compare the efficacy and safety of historical versus modern cataract treatments.
  • To highlight the continued practice of older techniques in specific regions.

Summary:

  • The ancient Indian technique of 'couching' involved displacing the opaque lens with a needle.
  • Jacques Daviel's lens extraction in 1748 marked a significant shift in cataract surgery.
  • Lens extraction has largely superseded couching in Western medicine due to superior results and lower complication rates.

Impact:

  • Understanding historical surgical practices provides context for current ophthalmological advancements.
  • The disparity in surgical technique adoption highlights global health inequalities.
  • Continued use of couching in some regions underscores the need for accessible, modern cataract surgery worldwide.