I’m assuming that QLTI’s PR about the Japanese approval of Visudyne uses the standard definitions of “improved vision” and “stable vision” accepted by the FDA:
Improved vision is defined as a gain of 3 or more lines on the eye chart relative to baseline; and
Stable vision is defined as a gain on the eye chart of less than 3 lines (i.e. not enough to be considered “improved”), no change, or a loss of less than 3 lines relative to baseline.
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