1.- First steps

1.0.- About auto-brightness and change brightness prevention

Written by Rodríguez-Vallejo M on 14 April 2020. Posted in 1.- First steps.

Summary: Settings -> General-> Accessibility -> Display Accomodation -> Switch off Auto-Brightness

For testing vision it is mandatory to switch off auto-brightness in order to maintain the background luminance constant for any environmental light used. The screen brightness can change if you put an App in second plane or if you put the iPad in the sleep mode. This can result in testing vision in...

1.1.- How to measure Visual Acuity with the ETDRS?

Written by Rodríguez-Vallejo M on 14 April 2020. Posted in 1.- First steps.

Indepently you measure Far, Intermediate or Near vision the ETDRS procedure is the same: Read only one letter per row. For instance, first letter starting from the left or from the right and go down after each correct answer After the first failure, go to the previous line and ask for reading...

1.2.- How to test Far Vision?

Written by Rodríguez-Vallejo M on 14 April 2020. Posted in 1.- First steps.

Select the presentation distance in the FAR picker -> Press Go below Far-> Confirm To measure far distance visual acuity you have first to select the distance in the FAR picker view, then put the iPad at the selected distance from the eyes and start to measure with the ETDRS. A confirmation...

1.3.- How to test Intermediate Vision?

Written by Rodríguez-Vallejo M on 14 April 2020. Posted in 1.- First steps.

Select the presentation distance in the INTERMEDIATE picker -> Press Go below Intermediate -> Confirm To measure intermediate visual acuity you have first to select the distance in the INTERMEDIATE picker view, then put the iPad at the selected distance from the eyes and start to measure with...

1.4.- How to test Near Vision?

Written by Rodríguez-Vallejo M on 14 April 2020. Posted in 1.- First steps.

Select the presentation distance in the NEAR picker -> Press Go below Near -> Confirm To measure near visual acuity you have first to select the distance in the NEAR picker view, then put the iPad at the selected distance from the eyes and start to measure with the ETDRS. A confirmation message...

1.5.- How to change the Chart to prevent memorization?

Written by Rodríguez-Vallejo M on 14 April 2020. Posted in 1.- First steps.

Select RE, LE or BE -> Press Go on the desired distance -> Confirm The App comes with a different set of letters in order to avoid memorization. Therefore either letters for distance, intermediate and near or right, left and both eyes differ to prevent memorization