Holograms make for better vision tests

Jul 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.

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.

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

Source: Optical Society of America

Explore further: Cooler bedroom temperatures may boost metabolic activity

add to favorites email to friend print save as pdf

Related Stories

The Medical Minute: Pediatric eye safety

Jul 29, 2010

Yes, the dog days of summer are upon us; for most families that signals the longstanding tradition of back to school preparation. It’s time to begin the search for the perfect backpack and notebook, shop for new clothing ...

Recommended for you

Stem cells from nerves form teeth

1 minute ago

Researchers at Karolinska Institutet in Sweden have discovered that stem cells inside the soft tissues of the tooth come from an unexpected source, namely nerves. These findings are now being published in the journal Nature and co ...

Human brain has coping mechanism for dehydration

13 hours ago

(HealthDay)—Although dehydration significantly reduces blood flow to the brain, researchers in England have found that the brain compensates by increasing the amount of oxygen it extracts from the blood. ...

User comments : 0