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Related Concept Videos

Current Trends in Nursing II01:30

Current Trends in Nursing II

Trends in nursing are multifactorial and associated with changes in society, within the nursing profession, and in other professions. Notably, telehealth and remote nursing contribute to successful healthcare delivery for numerous patients and help reduce stress for nurses due to nursing shortages. Nurses can reach patients, monitor their conditions, and interact with them using computers, audio, visual accessories, and telephones—for example, remote patient monitoring systems. Likewise,...
Issues And Trends In Healthcare Delivery System01:29

Issues And Trends In Healthcare Delivery System

The issues and trends in healthcare delivery are constantly changing. The COVID-19 pandemic is one recent issue that wreaked havoc on healthcare systems, causing a shortage of healthcare workers, high demand for medicines and supplies, and increased medical expenditure due to a lack of insurance. Other issues include rising healthcare costs and care fragmentation.
Cost Containment
Payment for healthcare services has historically promoted adoption of costly and often unnecessary or inefficient...
Current Trends in Nursing I01:28

Current Trends in Nursing I

Current trends in nursing include:
Hindsight Biases01:12

Hindsight Biases

Hindsight bias leads you to believe that the event you just experienced was predictable, even though it really wasn’t. In other words, you knew all along that things would turn out the way they did. Can you relate this to the phrase "Hindsight is 20/20" now?
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...
Focusing of Light in the Eye01:16

Focusing of Light in the Eye

Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...

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Related Experiment Video

Updated: May 19, 2026

Subjective Refraction Test Using a Smartphone for Vision Screening
05:36

Subjective Refraction Test Using a Smartphone for Vision Screening

Published on: October 18, 2024

Future trends in global blindness.

Serge Resnikoff1, Tricia U Keys

  • 1Brien Holden Vision Institute, The University of New South Wales, Barker St., Sydney, NSW 2052, Australia.

Indian Journal of Ophthalmology
|September 5, 2012
PubMed
Summary
This summary is machine-generated.

Global blindness prevalence has decreased since 1990, but data comparability remains a challenge. Reviewing global vision impairment trends highlights limitations in current data collection and definitions.

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Published on: March 27, 2013

Area of Science:

  • Ophthalmology
  • Public Health
  • Epidemiology

Background:

  • Global blindness and vision impairment represent significant public health challenges.
  • Understanding prevalence trends and causes is crucial for effective intervention strategies.

Purpose of the Study:

  • To review available data on the prevalence and causes of global blindness.
  • To discuss associated trends and limitations in global vision impairment data.

Main Methods:

  • A literature search was conducted using terms related to global blindness and vision impairment.
  • Seven relevant articles were selected for this review.

Main Results:

  • Global blindness prevalence, defined by best corrected visual acuity, decreased from 0.71% in 1990 to 0.55% in 2010.
  • A notable reduction of 0.73% per year was observed between 2002 and 2010.
  • Significant limitations exist in comparing global estimates due to varying definitions, methods, and data gaps.

Conclusions:

  • While global blindness prevalence shows a downward trend, data comparability issues hinder accurate global assessments.
  • Addressing uncertainties in causes, standardizing definitions and methods, and improving geographical data coverage are essential.