I agree with americanus, but due to the shape of their head they dont seem to see well upfront and thats why they tilt their head to the side when they strike, the eyes on the side of the head provide 20 degrees of binocular vision to judge distance and attack with accuracy. At night its a different story, with the pupils fully dilated, sharpness of vision is comparable to that of an owl's. Just like cats, gars have a thin layer of special reflecting tissue behind each retina called
tapetum lucidumm which acts like a mirror to concentrate all light when its dark (a definite advantage for a night active predator). This also causes fire red eyeshine at night when caught in a flashlight beam..
REFERENCE:
http://www.ncbi.nlm.nih.gov/sites/entrez?cmd=Retrieve&db=PubMed&list_uids=7866770&dopt=AbstractPlus