Category: VISUAL ACUITY TEST

Introduction
For some time we have used a clinical visual acuity test (subjective refraction) only for monocular testing. However, we believe that visual acuity measurements need to be performed under binocular open-view conditions as close to natural viewing conditions as possible.

Subjective refractions without cycloplegia were examined with BLOO (the product name is “Occlupad” in Japan), which modified a tablet device to create a binocular open-view visual acuity test device that would only display images that can be seen by one eye with a polarized lens. BLOO can display the Landolt-C chart on the monitor. To create BLOO, we removed only the polarizing film layer from the liquid crystal display (LCD) screen of a tablet. Thus, unless a subject viewed the screen using a circular polarizing lens, the LCD screen only appeared to produce a white backlight. Designing the polarizing filter to exactly match the polarization meant visual information could only be perceived by a human eye.

We are pleased to announce that our study has been published in Healio.com. For more information about this topic, please see the study linked below.

SEE THE STUDY

 

Tomoya Handa
Nobuyuki Shoji
Kimiya Shimizu

From Kitasato University, Japan

 

Published on Healio.com

Introduction
Making young children understand the content of visual acuity tests is not easy. For example, it can be difficult to get them to understand the visual acuity test targets on the Landolt Ring chart or Snellen chart. Eye charts for children that use simple symbols as visual targets have been reported, but the need to understand the visual target itself has not changed (Kastenbaum et al. 1977; Woodhouse et al. 1992; Hered et al. 1997; Vision in Preschoolers Study Group 2010). For example, with the use of a picture visual target, they need to understand what the picture visual target itself is (horse, car, etc.). Development of a visual acuity test for screening that young children can understand and respond to in a short time and with little difficulty is needed.

We have developed and verified a new screening visual acuity test for children. Our study has been published in the Wiley Online Library. For more information about this topic, please see the study linked below.

SEE THE STUDY

 

Tomoya Handa
Ran Nakadate
Tomoko Hatayama
Tsukushi Yokota
Nobuyuki Shoji

From Kitasato University, Japan

 

Published on onlinelibrary.wiley.com