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Confocal Fluorescence Microscopy

Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...

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Related Experiment Video

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

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Confocal scanning laser ophthalmoscope.

R H Webb, G W Hughes, F C Delori

    Applied Optics
    |May 11, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel confocal scanning laser ophthalmoscope. It achieves high-quality retinal imaging without pupil dilation by effectively managing light pathways and rejecting scattered light.

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    Multimodal Volumetric Retinal Imaging by Oblique Scanning Laser Ophthalmoscopy (oSLO) and Optical Coherence Tomography (OCT)
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    Spatio-Temporal In Vivo Imaging of Ocular Drug Delivery Systems using Fiberoptic Confocal Laser Microendoscopy
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    Spatio-Temporal In Vivo Imaging of Ocular Drug Delivery Systems using Fiberoptic Confocal Laser Microendoscopy

    Published on: September 27, 2021

    Area of Science:

    • Ophthalmology
    • Optical Engineering
    • Biomedical Imaging

    Background:

    • Confocal scanning imagers utilize synchronized illumination and detection spots.
    • Confocal scanning laser ophthalmoscopes reuse source optics for detection.
    • Common optical elements include mirrors, with scanners compensating for astigmatism.

    Purpose of the Study:

    • To develop a confocal scanning laser ophthalmoscope capable of producing clear retinal images.
    • To enable retinal imaging without the need for pupil dilation.
    • To improve the rejection of scattered light during retinal examination.

    Main Methods:

    • Utilizing mirrors (flat or spherical) as common optical elements.
    • Positioning scanners to correct astigmatism caused by mirror tilt.
    • Employing a small source beam aperture at the horizontal scanner.
    • Using a 1-mm avalanche photodiode detector at a pupillary plane with interchangeable stops at a retinal conjugate plane.

    Main Results:

    • The system effectively rejects scattered light, achieving an unusual degree of clarity for retinal viewing.
    • Selective discrimination between direct and scattered light components returning from the eye is possible.
    • Crisp and complete retinal images are obtained using He-Ne light.

    Conclusions:

    • The developed ophthalmoscope provides high-quality retinal imaging.
    • Pupil dilation is not required for obtaining detailed retinal images.
    • The optical design allows for effective management of light, enhancing diagnostic capabilities.