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Focusing of Light in the Eye

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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Related Experiment Video

Updated: Jun 22, 2026

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

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Devil's lenses.

Juan A Monsoriu, Walter D Furlan, Genaro Saavedra

|June 25, 2009

Summary

This summary is machine-generated.

Researchers developed new "devil

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Area of Science:

Optics and photonics
Diffractive optics
Fractal optics

Background:

Conventional kinoform lenses are widely used for optical focusing.
The development of novel diffractive optical elements (DOEs) can enhance focusing properties.

Purpose of the Study:

To introduce and analyze a new type of kinoform lens based on the "devil's staircase" function.
To compare the focusing properties of these novel fractal DOEs, termed devil's lenses (DLs), with conventional Fresnel kinoform lenses.

Main Methods:

Analytical study of the focusing properties of DLs.
Comparison of DLs with conventional Fresnel kinoform lenses under monochromatic and broadband illumination.

Main Results:

Under monochromatic illumination, a DL produces a single fractal focus that replicates the lens's self-similarity along the optical axis.
Under broadband illumination, DLs exhibit an increased depth of focus and reduced chromatic aberration due to the superposition of monochromatic foci.

Conclusions:

Devil's lenses (DLs) offer unique focusing characteristics compared to traditional kinoform lenses.
DLs demonstrate potential for applications requiring extended depth of focus and chromatic stability.