Authors
Wittich, Walter PhD, FAAO; St. Amour, Lorie MSc; Jarry, Jonathan MSc; Seiple, William PhD

Test-retest Variability of a Standardized Low Vision Lighting Assessment

publication date
June 19, 2018
Category
see more

Abstract/Introduction

SIGNIFICANCE 

Systematic lighting assessments should be part of low vision evaluations. The LuxIQ has gained popularity as an assessment tool, but its reliability has not been examined independently and is necessary for evidence-based vision rehabilitation.

PURPOSE 

Besides magnification, improved lighting levels are a common intervention in reading rehabilitation for individuals with low vision. Determining the appropriate lighting can be a complex and time-consuming task. The LuxIQ is a portable lighting assessment tool that can be used to systematically measure lighting preferences; however, there is little independent evidence to support its reliability in low vision rehabilitation.

METHODS 

One hundred nine control subjects (age, 18 to 85 years) and 64 individuals with low vision (age, 27 to 99 years) adjusted both the luminance and color temperature parameters on the LuxIQ while viewing a sentence on the MNREAD at their preferred print size for continuous reading. After 30 minutes, they were asked to repeat the same measurements.


Conclusion/Results

RESULTS 

Using Bland-Altman plots, test-retest variability was calculated using the limits of agreement (LOAs). For illuminance, the LOA width was 2806 lux for control subjects and 2657 lux for visually impaired participants. For color temperature, the LOA width was 2807 K for control subjects and 2364 K for those with a visual impairment. Difference scores were centered near zero, indicating overall accuracy.

CONCLUSIONS 

The measurement of lighting preference lacks the precision necessary for clinical utility, given that the LOA for luminance ranged more than 2600 lux, with normally sighted and low vision participants. Such variability translates into a range of approximately ±40 or 50 W in an incandescent light bulb, depending on the luminance level, making it clinically difficult to narrow down the options for evidence-based lighting recommendations. Next steps are to examine whether the reading behavior of low vision clients is positively affected by interventions that are based on LuxIQ recommendations.


Testimonials


  • My eight year old daughter was terrified to go to the eye doctor for fear of her eyes being dilated. The doctor was SO KID friendly! He immediately made her comfortable by engaging her in conversation. It was a geat experience.


    Joya B.

  • Dr. Garbus spent an amazing amount of time to solve my very complicated visual problems. Over the years he has continually achieved results beyond what others felt possible. He is always up to date on the latest science. He is great!


    Dolores K.

  • Family Vision Care Valencia makes it so easy. Staff is knows what they are doing and Dr. Garbus is thorough and kept me well informed during the exam.


    Kristy B.

  • I have been coming to Family Vision Center for almost 20 years. Dr. Garbus has been able to help my vision when other doctors could not. Now my kids see him as well. I highly recommend this office!


    Autumn C.

  • The Doctor is very good. I felt on this visit he seemed rushed. I had questions to ask him but he was already with another patient. I still do not know if my eyes are the same , worse, or better.


    Howard B.

Testimonials


My eight year old daughter was terrified to go to the eye doctor for fear of her eyes being dilated. The doctor was SO KID friendly! He immediately made her comfortable by engaging her in conversation. It was a geat experience.


Joya B.

Dr. Garbus spent an amazing amount of time to solve my very complicated visual problems. Over the years he has continually achieved results beyond what others felt possible. He is always up to date on the latest science. He is great!


Dolores K.

Family Vision Care Valencia makes it so easy. Staff is knows what they are doing and Dr. Garbus is thorough and kept me well informed during the exam.


Kristy B.

I have been coming to Family Vision Center for almost 20 years. Dr. Garbus has been able to help my vision when other doctors could not. Now my kids see him as well. I highly recommend this office!


Autumn C.

The Doctor is very good. I felt on this visit he seemed rushed. I had questions to ask him but he was already with another patient. I still do not know if my eyes are the same , worse, or better.


Howard B.

All the staff is friendly, helpful and knowledgeable, and has been for all the years I have been going there.


Mary Ann H.
1 2 3 13

Blog

Santa Clarita congratulation

Family Vision Care Optometry is now Amplify EyeCare Santa Clarita, led by Dr. Carl Garbus

Dear Patient,  As you may have noticed, we recently rebranded from Family Vision Care Optometry to Amplify EyeCare Santa Clarita. Even though our name has changed, our dedicated optometrists Dr.Carl Garbus and Dr.Lilia Babakhan will continue to provide exceptional patient care. We will maintain the high quality of patient care with our dedicated staff of […]

Read More
pexels-ksenia-chernaya-5765759

What is Behavioral Optometry?

Behavioral optometry employs an integrated approach to treatment that views the individual as more than a refractive error, a patient, or visual issue. Extending traditional eyecare beyond 20/20 vision. What is Behavioral Optometry? We are more than just our eyes. However, some of us may experience vision based problems. When most people think of eye-related […]

Read More
renshaw (1)

The Thatcher Effect Illusion

Does this person look normal to you? How about now? The eyes, and the brain, can fall prey to a range of optical illusions, for a variety of reasons. One such illusion is known as the Thatcher Effect. Named for former British Prime Minister Margaret Thatcher, since it was a photo of her that was […]

Read More
see all blogs

Contact Us To Amplify Your EyeCare

Working Hours

Monday - Thursday
8:00 am - 5:15pm
friday-sunday
Closed
Location
28089 Smyth Drive Santa Clarita, CA 91355
Website Accessibility Policy
Safety protocols page
Amplify Eyecare Santa Clarita phone-handsetarrow-uparrow-right linkedin facebook pinterest youtube rss twitter instagram facebook-blank rss-blank linkedin-blank pinterest youtube twitter instagram