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Related Concept Videos

Light Acquisition02:16

Light Acquisition

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In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
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The nature of light has been a subject of inquiry since antiquity. In the seventeenth century, Isaac Newton performed experiments with lenses and prisms and was able to demonstrate that white light consists of the individual colors of the rainbow combined together. Newton explained his optics findings in terms of a "corpuscular" view of light, in which light was composed of streams of extremely tiny particles traveling at high speeds according to Newton's laws of motion.
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The energy required to carry out photosynthesis is light— typically electromagnetic radiation from the sun. The range of all possible wavelengths is known as the electromagnetic spectrum.
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Field-effect transistors (FETs) are integral to electronic circuits and distinguished by their three-terminal setup: the gate, drain, and source. These transistors operate as unipolar devices, which utilize either electrons or holes as charge carriers, in contrast to bipolar transistors, which use both types of carriers. The primary function of the FET is to modulate the flow of these carriers from the source to the drain through a channel. The voltage difference between the gate and source...
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Light plays a significant role in regulating the growth and development of plants. In addition to providing energy for photosynthesis, light provides other important cues to regulate a range of developmental and physiological responses in plants.
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Consider two point charges, each exerting Coulomb force on the other. It is possible to describe the Coulomb interaction via an intermediate step by defining a new physical quantity called the electric field.
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Related Experiment Video

Updated: Feb 8, 2026

Quantitative Fundus Autofluorescence for the Evaluation of Retinal Diseases
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Published on: March 11, 2016

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Glare-free retinal imaging using a portable light field fundus camera.

Douglas W Palmer1,2, Thomas Coppin1,2, Krishan Rana1,2

  • 1Queensland University of Technology, Brisbane, QLD 4000, Australia.

Biomedical Optics Express
|July 10, 2018
PubMed
Summary

The novel retinal plenoptoscope uses light field technology for improved non-mydriatic retinal imaging. This device enhances image quality and enables 3-D retinal topography, overcoming limitations of current fundus cameras.

Keywords:
(100.6890) Three-dimensional image processing(110.1758) Computational imaging(170.4460) Ophthalmic optics and devices(230.0230) Optical devices

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Area of Science:

  • Ophthalmology
  • Biomedical Imaging
  • Optical Engineering

Background:

  • Portable non-mydriatic fundus cameras have limitations in image quality and stereoscopic imaging.
  • Current technologies struggle with issues like corneal backscatter, affecting diagnostic accuracy.

Purpose of the Study:

  • To introduce the retinal plenoptoscope, a novel light field imaging device.
  • To overcome limitations of existing fundus cameras, enhancing image quality and enabling stereopsis.
  • To develop methods for glare removal and 3-D retinal topography from a single exposure.

Main Methods:

  • Design and prototype construction of the retinal plenoptoscope.
  • Investigation of pupil, aperture stop, and micro-image separation relationships.
  • Development of glare identification and selective rendering for image correction.
  • Extension of glare-free methods to produce depth maps for retinal topography.

Main Results:

  • The retinal plenoptoscope offers higher stereopsis potential compared to stereo fundus cameras.
  • A novel method effectively removes corneal backscatter, improving image quality.
  • Glare-free depth maps and retinal topography representations were generated from single exposures.
  • Successful demonstrations on physical models and live human eyes.

Conclusions:

  • The retinal plenoptoscope is a viable and robust modality for non-mydriatic retinal imaging.
  • The device enables high-quality color and 3-D retinal imaging.
  • Advanced image processing techniques enhance diagnostic capabilities by providing retinal topography.