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Related Concept Videos

Focusing of Light in the Eye01:16

Focusing of Light in the Eye

Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...
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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.
In optical microscopy, the specimen to be viewed is placed on a glass slide and clipped on the stage...

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Related Experiment Video

Updated: Jun 22, 2026

Synthesis of Soft Polysiloxane-urea Elastomers for Intraocular Lens Application
11:49

Synthesis of Soft Polysiloxane-urea Elastomers for Intraocular Lens Application

Published on: March 8, 2019

Cubic optical elements for an accommodative intraocular lens.

Aleksey N Simonov, Gleb Vdovin, Michiel C Rombach

    Optics Express
    |June 17, 2009
    PubMed
    Summary
    This summary is machine-generated.

    A novel two-element varifocal Alvarez lens intraocular lens (IOL) mimics natural eye accommodation. This innovative IOL design achieves a 4-diopter accommodation range, offering improved vision correction.

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    Last Updated: Jun 22, 2026

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    Published on: March 8, 2019

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    Simulating the Mechanics of Lens Accommodation via a Manual Lens Stretcher
    05:14

    Simulating the Mechanics of Lens Accommodation via a Manual Lens Stretcher

    Published on: February 23, 2018

    Area of Science:

    • Ophthalmology
    • Optical Engineering
    • Biomedical Devices

    Background:

    • Presbyopia and cataracts reduce the eye's natural ability to focus.
    • Current intraocular lens (IOL) technology offers limited accommodative capabilities.
    • There is a need for advanced IOLs that restore functional accommodation.

    Purpose of the Study:

    • To introduce a new two-element varifocal Alvarez lens intraocular lens (IOL).
    • To evaluate the accommodative range and optical performance of the novel IOL design.
    • To demonstrate the potential of the Alvarez lens IOL for vision correction.

    Main Methods:

    • Design of a two-element Alvarez lens IOL with spherical and cubic surfaces.
    • Ray-tracing simulations for on-axis and off-axis vision analysis.
    • Manufacturing and experimental evaluation of an IOL prototype using a Shack-Hartmann wave-front sensor.

    Main Results:

    • The IOL design allows focal length change via lateral displacement of optical elements.
    • Ray-tracing simulations predicted good optical performance, minimizing refractive errors.
    • Experimental evaluation demonstrated an accommodation range of approximately 4 diopters with 0.75-mm displacement.

    Conclusions:

    • The two-element varifocal Alvarez lens IOL successfully mimics natural eye accommodation.
    • The prototype IOL achieves a significant accommodative range, validated by experimental data.
    • This IOL technology holds promise for restoring functional vision in patients with presbyopia and cataracts.