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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, whereas...
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Related Experiment Video

Updated: Jun 22, 2026

Intravitreal Injections in the Ovine Eye
03:37

Intravitreal Injections in the Ovine Eye

Published on: July 5, 2022

Vitreous growth hormone and visual dysfunction.

Misagh Ziaei1, Matthew Tennant, Esmond J Sanders

  • 1Department of Physiology, University of Alberta, Edmonton, Alberta T6G 2H7, Canada.

Neuroscience Letters
|May 26, 2009
PubMed
Summary
This summary is machine-generated.

Vitreous growth hormone (GH) levels were similar across various eye conditions in non-diabetics. However, diabetic patients showed lower vitreous GH, potentially indicating retinal neurodegeneration.

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Last Updated: Jun 22, 2026

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08:30

Glaucoma-inducing Procedure in an In Vivo Rat Model and Whole-mount Retina Preparation

Published on: March 12, 2016

Area of Science:

  • Ophthalmology
  • Endocrinology
  • Biochemistry

Background:

  • Growth factors in vitreous fluid regulate retinal function and indicate ocular dysfunction.
  • Growth hormone (GH) has been identified in human vitreous, suggesting potential roles in ocular health and disease.

Purpose of the Study:

  • To investigate if vitreous GH concentrations differ across various ocular disease states.
  • To assess the correlation between vitreous GH levels and diabetes, particularly in the context of retinal neurodegeneration.

Main Methods:

  • Quantification of GH-immunoreactivity in human vitreous samples using ELISA.
  • Comparison of vitreous GH concentrations between cadaver controls, non-diabetic patients with ocular dysfunction, and diabetic patients.

Main Results:

  • Vitreous GH concentrations were comparable across multiple non-diabetic ocular conditions (SH, VH, VD, RD, CRVO, MH, DCL, ERM).
  • Diabetic patients exhibited significantly lower vitreous GH concentrations compared to both controls and non-diabetic patients with ocular dysfunction.
  • No significant difference in vitreous GH was observed between diabetic patients with and without proliferative diabetic retinopathy (PDR).

Conclusions:

  • The presence of GH in the vitreous suggests a role in normal ocular function and disease pathogenesis.
  • Lower vitreous GH concentrations in diabetic patients may be linked to retinal neurodegeneration and could serve as a progression marker.