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Vision

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.

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Related Experiment Video

Updated: May 10, 2026

Simultaneous Evaluation of Cerebral Hemodynamics and Light Scattering Properties of the In Vivo Rat Brain Using Multispectral Diffuse Reflectance Imaging

Simultaneous Evaluation of Cerebral Hemodynamics and Light Scattering Properties of the In Vivo Rat Brain Using Multispectral Diffuse Reflectance Imaging

Published on: May 7, 2017

Optical Transmission in Single-Layer Brain Tissues under Different Optical Source Types: Modelling and Simulation.

Xi Yang^1,2, Chengpeng Chai^1,2, Yun-Hsuan Chen^1,2

¹CenBRAIN Neurotech Center of Excellence, School of Engineering, Westlake University, 600 Dunyu Road, Xihu District, Hangzhou 310030, China.

Bioengineering (Basel, Switzerland)

|September 27, 2024

Summary

This summary is machine-generated.

This study models optical propagation in single brain tissues, revealing distinct energy distributions for various light sources. Findings guide optimized light source selection for brain imaging techniques.

Keywords:

Monte Carlo simulation brain imaging optical imaging optical simulation photoacoustic imaging single-layer brain tissue

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Last Updated: May 10, 2026

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Area of Science:

Biomedical Optics
Neuroimaging
Computational Neuroscience

Background:

Current brain models often overlook individual tissue optical properties.
Understanding light propagation in single brain tissues is crucial for advanced neuroimaging.

Purpose of the Study:

To investigate the influence of diverse optical source types on individual brain tissue optical properties.
To simulate light propagation in single-layer brain tissue models.

Main Methods:

Construction of single-layer brain tissue models.
Optical propagation simulation using the Monte Carlo method.
Analysis of optical energy distribution and depth penetration for various light sources.

Main Results:

Sixteen optical source types exhibited unique energy distributions across brain tissues.
Cerebrospinal fluid showed distinct optical distribution characteristics.
Scalp, skull, cerebrospinal fluid, gray matter, and blood vessels shared optimal light sources for maximum depth, while white matter differed.
Maximum and minimum full width at half maximum varied significantly among tissues and light sources.

Conclusions:

This research provides foundational data for complex, multi-layer brain models.
Offers a theoretical basis for selecting optimal optical sources in brain imaging applications.