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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.
The Effect of Aging on Tissues01:19

The Effect of Aging on Tissues

Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
Anatomy of the Eyeball01:20

Anatomy of the Eyeball

The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle layer, the vascular tunic,...
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...
Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Absorption01:22

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Absorption

As individuals age, their body's physiology evolves, affecting drug pharmacokinetics. The most apparent changes occur in the gastrointestinal tract, where an increase in gastric pH, a delay in gastric emptying, and a reduction in gastrointestinal motility are observed. Remarkably, these changes do not substantially modify the absorption of orally administered drugs, particularly those absorbed via passive diffusion.Transdermal drug delivery emerges as a highly viable method for older adults due...
Aging01:26

Aging

Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...

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Updated: May 24, 2026

A Standardized Obstacle Course for Assessment of Visual Function in Ultra Low Vision and Artificial Vision
09:29

A Standardized Obstacle Course for Assessment of Visual Function in Ultra Low Vision and Artificial Vision

Published on: February 11, 2014

Aging, physiology, and vision

S C Smith1

  • 1University of Iowa Hospitals and Clinics, Iowa City 52242, USA.

Nurse Practitioner Forum
|June 13, 1998
PubMed
Summary
This summary is machine-generated.

Aging causes normal vision changes and related symptoms. Understanding these age-related vision shifts helps reduce patient anxiety and aids healthcare providers in assessing and treating eye conditions.

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Last Updated: May 24, 2026

A Standardized Obstacle Course for Assessment of Visual Function in Ultra Low Vision and Artificial Vision
09:29

A Standardized Obstacle Course for Assessment of Visual Function in Ultra Low Vision and Artificial Vision

Published on: February 11, 2014

Using Looming Visual Stimuli to Evaluate Mouse Vision
05:07

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Area of Science:

  • Ophthalmology
  • Gerontology
  • Physiology

Background:

  • Vision changes are a common concern for aging individuals.
  • Patient anxiety often stems from unexplained visual symptoms.
  • Distinguishing normal aging from pathological conditions is crucial.

Purpose of the Study:

  • To provide an overview of normal physiological vision changes during aging.
  • To discuss common, concerning symptoms associated with age-related vision decline.
  • To clarify the distinction between normal and pathological visual symptoms.

Main Methods:

  • Literature review of age-related vision changes.
  • Discussion of patient-reported visual symptoms.
  • Analysis of the causes and rationale behind these changes.

Main Results:

  • Identified normal physiological vision alterations in the aging process.
  • Cataloged common symptoms that cause patient worry.
  • Explained the underlying reasons for these visual complaints.

Conclusions:

  • Clear explanations of age-related vision changes reduce patient anxiety.
  • Understanding normal versus pathological vision symptoms improves patient safety.
  • Enhanced knowledge aids healthcare providers in managing ophthalmic issues.