keep someone's eyes open

Keep eyes open to market changes, CattleFax's Blach says
Infertile Males with Muscle Weakness: Keep Your Eyes Open for Myotonic Dystrophy
A young man with vision loss: keep your eyes open for a rare cause
Things better, but we've got to keep eyes open, powder dry
Let's all keep our eyes open around the pool
Keep your eyes open: challenges and opportunities in ophthalmic therapeutics.
Nina Koivum�ki: Keep Your Eyes Open!
KEEP YOUR EYES OPEN
Buyers Keep Eyes Open For Expected Issues
Life's a Beach to Comb Fancy a Beer? A New Pair of Trainers? A Lego Set? Just Go to the Beach and Keep Your Eyes Open