<qa>  What is the best corrected visual acuity?3. Best corrected visual acuity 20400 or better as measured on an ETDRS chart in the eye with clinically significant macular edema; this eye will be considered they study eye. If both eyes have clinically significant macular edema and best corrected visual acuity greater than or equal to 20400, the right eye will be considered the study eye, however, both eyes will be eligible for treatment. 