What's New in Healthcare
Parkinson's disease patients have reduced visual contrast acuity
Patients with Parkinson's disease (PD) often have difficulties
with visual acuity in low-contrast images. Because they may have normal
high-contrast vision, this is often overlooked during routine eye exams. In the
current issue of the Journal of Parkinson's Disease, researchers report that PD patients had significantly
worse vision for low-contrast images at close (40 cm) and far (2 m) distances.
Even for high-contrast images, PD patients' vision was deficient at far
Click here for the entire article and for more information.
addition, the degree of low-contrast visual deficiency correlated with PD
severity, suggesting that such visual testing may provide insights for the
physician in the diagnosis and treatment of PD. To provide an easy-to-use screening
tool for physicians, the investigators have developed an iPad®-based application
that can replace the traditional paper charts used in normal eye testing.
patients with PD and 71 control subjects were studied. All subjects received a neurological
examination, which included the Unified Parkinson's Disease Rating Scale (UPDRS),
and vision testing using the Variable Contrast Acuity Chart displayed on an Apple®
iPad 2. Usual corrective lenses were worn by subjects that required them.
impairments can have a significant impact on quality of life and day-to-day functions,"
explained lead investigator Charles H. Adler, MD, PhD, Department of Neurology,
Mayo Clinic College of Medicine, Scottsdale, AZ. "However, impaired
contrast sensitivity in PD patients is a topic that has received relatively
little attention in clinical practice. The electronic form of low contrast
acuity letter chart we used in this study combines contrast sensitivity with
visual acuity testing and is quick and easy to administer. It is portable, quantitative, and adjustable
for testing distances and contrast levels.".
The above story is based on materials provided by IOS Press BV.
Note: Materials may be edited for content and length.
What Are Your Thoughts?
We want to hear from you Tell Us More