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Imaging Biological Samples with Optical Microscopy

Imaging Biological Samples with Optical Microscopy

Optical microscopy uses optic principles to provide detailed images of samples. Antonie van Leeuwenhoek designed the first compound optical microscope in the 17th century to visualize blood cells, bacteria, and yeast cells. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes with enhanced magnification and resolution.
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The early pioneers of microscopy opened a window into the invisible world of microorganisms. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes that leveraged nonvisible light, such as fluorescence microscopy that uses an ultraviolet light source and electron microscopy that uses short-wavelength electron beams. These advances significantly improved magnification, image resolution, and contrast. By comparison, the...

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Related Experiment Video

Updated: Jun 15, 2026

Multimodal Volumetric Retinal Imaging by Oblique Scanning Laser Ophthalmoscopy (oSLO) and Optical Coherence Tomography (OCT)

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Scanning mirror microscope with optical sectioning characteristics: applications in ophthalmology.

|March 12, 2010

Summary

This study presents an optical sectioning technique using an oscillating mirror for precise specimen illumination and viewing. This method enhances image clarity by rejecting scattered light, with applications in ophthalmology.

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Area of Science:

Biomedical optics
Microscopy techniques

Background:

Optical sectioning is crucial for high-resolution imaging of biological specimens.
Scattered light degrades image quality in conventional microscopy.

Purpose of the Study:

To describe an optical sectioning method utilizing an oscillating mirror.
To optimize image illuminance and resolution for specimen examination.

Main Methods:

Simultaneous illumination and viewing of a thin specimen region.
Lateral scanning of an illuminated slit using an oscillating mirror.
A second slit to reject out-of-focus light and enhance image quality.

Main Results:

The technique successfully rejects scattered light from other depths.
Achieved optimization for image illuminance and resolution.
Demonstrated applicability in ophthalmological examinations, specifically of the corneal endothelial cell layer.

Conclusions:

The described optical sectioning method provides clear imaging by selectively passing light from the desired plane.
The technique is valuable for detailed examination of delicate biological structures like the corneal endothelium.