Central Steady Maintained method for assessing visual aquity.
| Fixation Pattern | Visual Acuity |
| Affixation | |
| Eccentric | 5/200 or less |
| Unsteady | 5/200 to 20/300 |
| Central but not held | 20/200 to 20/100 |
| Central will hold OU but prefers one eye | 20/70 to 20/30 |
| Alternates spontaneously | 20/20 OU |