BAT (Brightness Acuity Tester)

BAT (Brightness Acuity Tester)BAT is used to test glare disability. The Brightness Acuity Tester can simulate three bright light conditions: 1) Direct overhead sunlight; 2) Partly cloudy day; 3) Bright overhead commercial lighting. The vision is measured using the low, medium or high light settings of the BAT. If the vision falls with light then the patient is deemed to have glare disability.

Conditions of glare and low lighting arise in the course of many workplace tasks (e.g., driving, construction work, computer use). Strong extraneous light sources such as oncoming headlights or a bright sky often surround a visual target, creating glare problems. In addition to the cataract causing glare, light scatter from airborne particles or irregularities on otherwise transparent surfaces, such as windows and spectacle lenses may also contribute to glare. The impact of glare depends on the demands of the visual task. For example, when looking at a person silhouetted against a window or a very bright sky, contrast reduction can make it difficult to discern features in the face. In driving, detecting pedestrians, the edge of the roadways or reading signs against a bright sky, sun, or headlights is likely to be difficult if ability to see in the presence of glare is impaired.


Schedule an Appointment

Fill out the form below to contact us about a free consultation. One of our representative will contact you shortly to schedule an appointment.

Join our Newsletter

Be the first to know about our special promotions.

COVID-19 Update

Neovision Eye Center will be closed for eye examination appointments until May 4th, 2020.

Our staff will be checking phone messages periodically and is available to assist you, as needed. 

Please direct non-urgent phone calls to 510-431-5511. Be sure to leave your email address in your message, and we will get back to you as soon as possible.

Union City