Related Experiment Video
Updated: Jul 26, 2026

06:55
Scanning Light Scattering Profiler (SLPS) Based Methodology to Quantitatively Evaluate Forward and Backward Light Scattering from Intraocular Lenses
Published on: June 6, 2017
Effects of retinal scattering in the ocular double-pass process
1Blackett Laboratory, Imperial College of Science, Technology and Medicine, London, UK. luisd@ic.ac.uk
Summary
This study reviews double-pass wave-front measurements in the eye. It demonstrates how retinal scattering affects phase information loss during this process.
Area of Science:
- Ophthalmology
- Optical Engineering
- Biomedical Optics
Background:
- Double-pass (DP) systems are used for objective eye examination.
- Accurate wave-front measurements are crucial for understanding visual optics.
Purpose of the Study:
- To analytically and computationally review the validity of double-pass wave-front measurements.
- To describe the scalar optical field after an ocular double-pass.
- To demonstrate the link between retinal scattering and phase information loss.
Main Methods:
- Analytical review of double-pass wave-front measurement validity.
- Computational modeling of the scalar optical field in the exit pupil plane.
- Mathematical description of the ocular double-pass process.
Main Results:
- A mathematical description of the optical field after a double-pass was developed.
- The study demonstrated how retinal scattering properties influence phase information loss.
- The relationship between scattering statistics and information loss was quantified.
Conclusions:
- Double-pass wave-front measurements are valid when considering retinal scattering.
- Retinal scattering significantly impacts the accuracy of wave-front measurements.
- Understanding these relationships improves ocular optical analysis.
Related Concept Videos
The Retina
The retina is a layer of nervous tissue at the back of the eye that transduces light into neural signals. This process, called phototransduction, is carried out by rod and cone photoreceptor cells in the back of the retina.
Vision
Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
Anatomy of the Eyeball
The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle layer, the vascular tunic,...
Photoreceptors and Visual Pathways
At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...

