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Related Concept Videos

Accessory Structures of the Eye01:17

Accessory Structures of the Eye

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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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...
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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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Open Angle Glaucoma: Treatment

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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Mutations01:35

Mutations

Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
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Related Experiment Video

Updated: Jul 15, 2026

Measuring the Behavioral Effects of Intraocular Scatter
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Published on: February 18, 2021

Sunshine on holidays--eye risks.

Damir Bosnar1, Zeljka Karaman Martinović, Iva Dekaris

  • 1University Department of Ophthalmology, General Hospital "Sveti Duh", Zagreb, Croatia. damirbosnar@net.hr

Collegium Antropologicum
|May 2, 2007
PubMed
Summary

Acute ultraviolet (UV) radiation exposure can cause eye injury, including persistent circular stromal infiltration. This case report highlights a novel connection between UV exposure and this specific corneal condition in humans.

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Area of Science:

  • Ophthalmology
  • Environmental Health

Background:

  • Ultraviolet (UV) light is a primary cause of ocular radiation injury.
  • Acute UV exposure commonly results in photokeratitis and photoconjunctivitis.

Observation:

  • A patient exposed to intense sun developed conjunctival injection, chemosis, and corneal edema with fluorescein-positive defects.
  • More severe epithelial bullous changes and circular stromal infiltration were noted in the left eye.

Findings:

  • Following treatment, corneas became transparent and fluorescein negative, with residual moderate conjunctival injection and persistent circular stromal infiltration.
  • This case is the first to document a link between acute UV radiation exposure and persistent circular stromal infiltration in the human corneal periphery.

Implications:

  • This finding expands the known spectrum of ocular damage from UV radiation.
  • Highlights the importance of UV protection to prevent potentially persistent corneal changes.