Related Experiment Videos
Retinal nerve fiber layer thickness in normal human eyes
1Glaucoma Service, Doheny Eye Institute, University of Southern California School of Medicine, Los Angeles 90033, USA.
Ophthalmology
|December 1, 1996
Summary
Histologic measurements of the retinal nerve fiber layer (RNFL) in human eyes reveal variations in thickness across different retinal regions. These findings provide crucial data for evaluating in vivo RNFL measurement devices.
Area of Science:
- Ophthalmology
- Histology
- Neuroscience
Background:
- The retinal nerve fiber layer (RNFL) is critical for visual function.
- Accurate measurement of RNFL thickness is essential for diagnosing and monitoring various ocular diseases.
Purpose of the Study:
- To determine the precise histologic thickness of the RNFL in normal human eyes.
- To establish normative data for RNFL thickness across different retinal locations.
Main Methods:
- Postmortem human eyes (n=10) were obtained within 6 hours of death.
- Retinas were dissected, sectioned, and RNFL thickness was measured histologically in four quadrants.
- Measurements were taken at the disc margin, at intervals from the disc, at the fovea, and in the retinal periphery.
Main Results:
- Mean RNFL thickness at the disc margin varied by quadrant (superior: 405µm, inferior: 376µm, nasal: 372µm, temporal: 316µm).
- RNFL thickness decreased with increasing distance from the optic disc.
- RNFL thickness showed an inverse relationship with age in superior and inferior quadrants and was thinnest near the fovea and in the retinal periphery.
Conclusions:
- Human peripapillary RNFL is thicker than in nonhuman primates.
- The papillomacular bundle region exhibits the thinnest peripapillary RNFL.
- These histologic data serve as a benchmark for assessing the accuracy of in vivo RNFL imaging technologies.