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Table 2 Compressed Assessment of Ability Related to Vision (CAARV)

From: A prospective, longitudinal, observational cohort study examining how glaucoma affects quality of life and visually-related function over 4 years: design and methodology

1. Computerized motion detection

A large black cross against a white background on a computer screen provides a point of fixation. While fixating on the cross, one at a time, 14 balls of different sizes and colors move diagonally across the screen from either the right or the left side at a constant speed. Yellow, red, or blue balls are used. The patient is asked to count the number of moving balls. Each ball seen counts as ½ point. Highest score is 7 and lowest score is 0.

2. Facial expression recognition

Seven full-face professional, colored photos of varying sizes and facial expressions (angry, sad, happy, or surprised) are presented on a computer screen at a distance of ½ meter. The patient receives one point for recognizing the facial expression. Score ranged from 0 to 7 with 7 being the highest score.

3. Recognizing street signs

Seven written word signs ranging from large to small are read at a distance of 4 meters. One character in each sign was changed from familiar phrases making the word difficult to guess. For example, the top sign reads SUGAR DANE, which is similar to the more familiar sugar cane. The patient is instructed not to guess. One point is given for each sign read correctly. Highest score is 7 and lowest score is 0.

4. Locating objects

Fourteen red and beige boxes of different sizes are scattered around the testing room (4 x 2 meters). Sample boxes are shown before test started. The patient attempts to locate the boxes while seated. Each box found is worth ½ point. Highest score is 7 and lowest 0.