Fig 6. Retinal vein caliber increased sharply as IOP was lowered past a threshold value.
(a) Retinal vein caliber was approximately constant while IOP was above 7 mmHg, increase sharply as IOP was decreased from 7 mmHg to 5 mmHg, then was approximately constant as IOP was decreased further to 3 mmHg. (b) Retinal vein in its baseline state. (c) Retinal vein in its dilated state.