Eye on Vision August 2015

Eye on Vision August 2015 Newsletter

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This month in Eye on Vision Video

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It’s Trade Show Season again and our Amy Girouard gives you a sneak peek at just where we will be this season. Click on the picture above to see our Trade Show Trailer Video.

 

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Precision Vision Looks to Make a Visible Difference in Illinois Elementary School Children

With Labor Day right around the corner, the familiar sounds of school bells ringing have begun all over the country. This year, Precision Vision is looking to assist Illinois Elementary School Children in starting the year off right. That’s why they  recently announced their Early Detection Screening Program. 

The Precision Vision Early Detection Screening Program isEOV 082015-3 designed specially for Illinois  students, providing comprehensive, on-site screening services in compliance with the State  of Illinois’ Public Health Code requirements – at no cost to the school or district. 

“Extensive research has proven that maintaining healthy vision and detection of vision conditions early in the school year and early in life will support proper physical, intellectual, social and kinesthetic development in all children,” said Precision Vision President Ed Kopidlansky. As a long time provider of Pediatric Vision Assessment tools, we thought we should lend a hand”.

The Precision Vision program will provide certified screeners to administer all vision assessments required under the State of Illinois’ Public Health Code, and will work within the parameters of each school’s calendar to determine the screening days.

Interested School Districts are instructed to call the Precision Vision Early Detection Screening Program Hot-line (312) 867-9122.  

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More on MNREAD

In a follow-up to last month’s Behind the Test video on the MNREAD Chart noted Vision Scientist Luisa Mayer, Ph.D. offers her take on the famous test and its use in any functional vision examination of a patient with low vision, including children.

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My Thoughts on the MNREAD Chart

Visual acuity as measured in standard eye examination isEOV 082015-4 not a good predictor of reading vision although it is a good general starting point for prescribing glasses. 
   
The MNREAD test was developed by Dr. Gordon Legge and his colleagues at the University of Minnesota (hence MNREAD) to measure aspects of reading ability which are important in a patient’s daily life. The test measures the patient’s best reading speed (fastest accurate reading), the critical print size for fluent reading, and the smallest print size read (reading acuity). Performance on MNREAD test is widely used in clinical trials research to investigate the effects of treatment for eye diseases.  The test is also used to evaluate reading ability in patients with low vision due to different causes, including age related macular degeneration, retinitis pigmentosa, diabetic retinopathy, and glaucoma. Research has shown that prescription of low vision devices is effective and successful using MNREAD. 
MNREAD uses modern principles of test design needed for accurate and reliable results, such as logMAR spacing between print sizes, a wide range of print sizes so that reading ability can be measured in patients with severe low vision through throughout the range of visual impairment to those with normal or near normal vision. 
The Precision Vision MNREAD has two versions, the standard black print on white chart, and a chart with white print on black background for patients with problems with light glare. The PV MNREAD charts also come in 5 versions with different sentences (to avoid memorization by the patient) that are equated for reading ease and comprehensibility. 
MNREAD has high test-retest repeatability and excellent correspondence with other measures of reading performance in adults.  The MNREAD test is as reliable in children, grades 3 to 8, as visual acuity measured with ETDRS charts
The test has been translated into other languages, and Precision Vision provides two versions in Spanish.  
Because of MNREAD’s excellent test properties and extensive background research, I advocate it’s use in any functional vision examination of a patient with low vision, including children who are able to read paragraph books. Best reading speed and critical print size for reading are important, real life skills that can be directly translated into useful recommendations for print materials. Comparing results from the white vs. black charts may help determine the polarity of tablets that enable most efficient reading. Low vision devices can be carefully evaluated using MNREAD measures. The Precision Vision versions of MNREAD should result in accurate measurement and reliable follow up results. 
D. Luisa Mayer, Ph.D.
Associate Professor 
New England College of Optometry
Clinician, New England Eye Low Vision Clinic
Perkins School for the Blind
and
Associate Scientist
Boston Children’s Hospital

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This month we take a look at some of the most frequently asked questions that we receive from our Web Customers on our live chat. 

Q:   When using a near vision chart where should the end of the cord relative to the patient be, nose or temple?

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A:   Great question and one we get a lot.  The proper placement is to the temple or outside corner of the eye.

Q: Is there a recommended “ambient” lighting to be used with the Illuminator Cabinet?

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A: Unless otherwise specified in a study protocol, standard room lighting is sufficient.

Q: An eye exam in Europe indicated an acuity of 6/10. How would that convert to Snellen acuity?

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A: Snellen acuity was 20/32

Q: How is visual acuity defined?

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A: Using the Snellen formula in its metric version: 

Q: How many letters can be missed on a 10ft Snellen chart and still be considered “passed”?

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A: Generally speaking, half of the optotypes in a line need to be properly identified to be considered passed.

Q: What is the standard luminance for Illuminator cabinets for clinical trials?

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A: Standard luminance for clinical trials is 160 cd /m2

Q: Is there a standard height to hang a wall chart?

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A: There isn ’t really a standard height, rather, charts should be hung relative to the height/eye level of the average patient being examined. So, for example, exams for kindergarten students would have the chart hung lower than for high school students

Q: My patients are not familiar with the Roman alphabet. Do you have a product we can use?

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A:No worries!  Precision Vision carries numerous alternatives for populations not familiar with the Roman alphabet including Landolt C, Tumbling E and  European Wide.  

Q: What is the difference between translucent and traditional eye charts?

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A: Translucent allow light through while traditional charts are opaque.

Q: Using near vision charts with cords attached, who holds the chart and cord, the patient or the eye care professional?

A: If physically able the patient holds the chart and the cord.

 

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