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Introduction to Visual Acuity Measurement
#Colenbrander#Low Contrast#Low Vision#Reading#Visual Acuity
May 23, 2025

Introduction to Visual Acuity Measurement

by August Colenbrander, MD – San Francisco Since the 1970’s Precision Vision has built a reputation of producing the most ...

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November, 2019- Retinal Detachment – Protect Your Patients & Yourself!

IN THE NEWS

American Academy of Ophthalmology Weighs in on Malpractice Risk: Retinal Detachment

“When we look at the clinical categories of diag­nostic error, retina claims far exceed all other types in both number and percentage,” said Dr. Menke, Ophthalmic Mutual Insurance Company (OMIC) patient safety manager, who is based in San Francisco. “And by far, the most frequently missed diagnosis in our entire study was RD—nothing else came close.” Read more from the Academy of Ophthalmology in the link below.

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PRODUCT PROFILE

The Zhang Ring Test™ was designed by Dr. Fuxiang Zhang, MD in conjunction with the Henry Ford Health System as very effective tool for patient self-detection and emergency medicine providers for a screening test to promote early diagnosis of retinal detachment.

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ASK PV

Each issue we will take a look at some of the most frequently asked questions that we receive and feature a Q & A below!

Q: How are the take home tests sold? And can they be used repeatedly?

A: Great questions! The Zhang Ring Test™ is sold in a tablet consisting of 50 sheets. Simply tear one page out and send it home with your patient. Explain to them the directions and tell them to immediately call if they see distortion or a break in the ring with their peripheral vision. You should test them before sending them home. The test may be repeated as long as it remains unblemished and in good condition.