Table 1: Summary of results for groups tested using the Snellen Chart (Snellen VA) and the iPad mini 2 app (iPad VA) including the mean, number of participants, standard deviation and the standard error mean.

 

Mean

N

Std. Deviation

Std. Error Mean

Pair 1

Snellen VA OD

0.247525

100

0.2534718

0.0263472

iPad VA OD

0.204815

100

0.2609070

0.0270907

Pair 2

Snellen VA OS

0.227780

100

0.2568615

0.0276861

iPad VA OS

0.197417

100

0.2670464

0.0287046

Pair 3

PH VA Snellen OD

0.104946

25

0.1221205

0.0244241

PH VA iPad OD

0.092000

25

0.1312404

0.0262481

Pair 4

PH VA Snellen OS

0.101568

27

0.1355562

0.0260878

PH VA iPad OS

0.105485

27

0.1435641

0.0274779