Holograms make for better vision tests

July 05, 2007

A new paper published in the July 1 issue of OSA's Optics Letters shows that researchers in Australia have created a new one-step test that uses holograms to diagnose the astigmatic error of the human eye, a key measurement in determining the appropriate prescriptions for eye glasses in patients. This new technique adds to an earlier one, developed by the same researchers, for using a single hologram to measure another important property, the spherical refractive error of the eye.

Summary

In this new test, patients view a hologram consisting of sunburst patterns; by reporting which sunburst lines appear clearest, the eye doctor can obtain information he or she can use in determining the correct prescription for the patient. Traditionally, patients look through a series of lenses until they find which one gives each eye the clearest view of a distant target such as an eye chart on a wall. This multi-step process of finding the right lens can be cumbersome and complex. Holography offers many advantages including simplicity, high speed and low cost and could open new doors in our understanding of human vision. This approach still needs to be tested on young astigmatic individuals, whose nature of vision is not fully known. The same method has also been found to work well in measuring the refractive error of non-astigmatic subjects. The results of that research will appear in a future issue of OSA's journal JOSA-A.

Paper

"Holographic multivergence target for subjective measurement of the astigmatic error of the human eye," Optics Letters, Vol. 32, Issue 13, pp. 1926-1928.

Abstract

In subjective refraction the spherical and cylindrical errors of the human eye are measured. Recently, we reported a technique by which the spherical error can be measured in one step using a hologram. We have now developed a holographic target consisting of sunburst patterns to measure the astigmatic error of the human eye as well. Apart from being simple, quick, and low cost, holography offers the advantage of being an open field refraction system that is devoid of the problem of proximal accommodation. We describe the holographic target, its working principles, the measurement procedure, and the initial results obtained.
-end-


The Optical Society

Related Vision Articles from Brightsurf:

School-based vision screening programs found 1 in 10 kids had vision problems
A school-based vision screening program in kindergarten, shown to be effective at identifying untreated vision problems in 1 in 10 students, could be useful to implement widely in diverse communities, according to new research in CMAJ (Canadian Medical Association Journal) http://www.cmaj.ca/lookup/doi/10.1503/cmaj.191085.

Restoring vision by gene therapy
Latest scientific findings give hope for people with incurable retinal degeneration.

Vision loss influences perception of sound
People with severe vision loss can less accurately judge the distance of nearby sounds, potentially putting them more at risk of injury.

'Time is vision' after a stroke
University of Rochester researchers studied stroke patients who experienced vision loss and found that the patients retained some visual abilities immediately after the stroke but these abilities diminished gradually and eventually disappeared permanently after approximately six months.

Improving the vision of self-driving vehicles
There may be a better way for autonomous vehicles to learn how to drive themselves: by watching humans.

A new model of vision
MIT researchers have developed a computer model of face processing that could reveal how the brain produces richly detailed visual representations so quickly.

Vision may be the real cause of children's problems
Do you have poor motor skills or struggle to read, write or solve math problems?

Shark and ray vision comes into focus
Until now, little has been known about the evolution of vision in cartilaginous fishes, particularly sharks and their genetic cousins, the rays.

The birth of vision, from the retina to the brain
How do neurons differentiate to become individual components of the visual system?

Tracing the evolution of vision
The function of the visual photopigment rhodopsin and its action in the retina to facilitate vision is well understood.

Read More: Vision News and Vision Current Events
Brightsurf.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.