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Accessory Structures of the Eye01:17

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Optical perception, or vision, is an extraordinary sense dependent on converting light signals received via the ocular organs. These organs, known as eyes, are securely positioned within the bony cavities of the skull, called orbits. The orbits serve a dual purpose: a protective shield for the ocular globes and a stable attachment point for the soft ocular tissues. The eye's external protective mechanisms include the eyelids, which are edged with lashes that act as a barrier against foreign...
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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,...
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Glaucoma is an eye condition characterized by increased intraocular pressure that damages the retina and optic nerve, leading to irreversible blindness if left untreated. The human eye has various components, including the cornea, iris, pupil, lens, and optic nerve. Aqueous humor is secreted by the epithelium of the ciliary body in the posterior chamber and flows through the trabecular meshwork and canal of Schlemm, maintaining normal intraocular pressure. The trabecular meshwork and the canal...
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Open Angle Glaucoma: Treatment01:27

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In open-angle glaucoma, the iridocorneal angle remains open, but the trabecular meshwork becomes stiff, slowing down the outflow of aqueous humor. This causes a buildup of aqueous humor in the anterior chamber, leading to a sudden increase in intraocular pressure. The treatment for open-angle glaucoma focuses on reducing the elevated intraocular pressure by either decreasing the secretion of aqueous humor or increasing its outflow.
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Angle Closure Glaucoma: Treatment01:28

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Angle-closure glaucoma, or closed-angle glaucoma, is an eye condition where the iris bulges out and blocks the iridocorneal angle, resulting in a buildup of aqueous humor and increased intraocular pressure. Immediate medical attention is necessary due to the sudden onset of symptoms. The treatment for angle-closure glaucoma includes short-term and long-term approaches. Short-term treatment involves using eye drops like pilocarpine to lower intraocular pressure by increasing aqueous humor...
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Aging01:26

Aging

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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.
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Updated: Oct 15, 2025

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Vision through Healthy Aging Eyes.

Nir Erdinest1, Naomi London2, Itay Lavy1

  • 1Department of Ophthalmology, Hadassah-Hebrew University Medical Center, Jerusalem 91120, Israel.

Vision (Basel, Switzerland)
|October 26, 2021
PubMed
Summary
This summary is machine-generated.

As people age, vision naturally declines, impacting daily tasks. This review details age-related visual changes and potential innovations to maintain independence in older adults.

Keywords:
agingcontrast sensitivitydry eyevisionvisual acuityvisual fields

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Area of Science:

  • Ophthalmology
  • Gerontology
  • Neuroscience

Background:

  • Increasing life expectancy leads to a greater number of individuals experiencing age-related changes.
  • While many diseases are age-associated, this review focuses on visual alterations in healthy aging.
  • These visual changes significantly affect perception and daily activities like reading and driving.

Purpose of the Study:

  • To provide an updated overview of common visual changes in healthy aging.
  • To discuss the physical and cellular modifications in the visual system.
  • To highlight innovations for preserving independence in the aging population.

Main Methods:

  • Mini-review of current literature on age-related visual changes.
  • Analysis of physical developments in the eye and visual pathway.
  • Examination of resulting visual manifestations and potential future treatments.

Main Results:

  • Age-related changes include decreased pupil size, retinal luminance, and altered intercellular connections.
  • Modifications occur in retinal cell quantity and location (photoreceptors, ganglion, bipolar cells).
  • Reduced clarity of intraocular organs like the lens leads to common visual issues.

Conclusions:

  • Common visual manifestations include reduced acuity, dry eyes, presbyopia, and slower processing speed.
  • Age-related visual decline impacts daily function, necessitating supportive interventions.
  • Future innovations aim to mitigate these changes, preserving independence and mobility in older adults.