Trout Vision, not unlike Marks after a few refreshment, it's better then you think.A trout's range of vision includes regions of both monocular and binocular vision . Due to the arrangement of rods (dim light sensitive) and cones (colour and detail sensitive) in the trout's eye, it can effectively see in most directions at once (both binocular and monocular regions). Given the placement and limited range of movement of their eyes, there is also a region in which a fish cannot see - a blind spot. 
Salmonids are unable to hold position while oriented downstream (with the flow) because of their body design. Their large caudal fin provides propulsion while relatively small pectoral and pelvic fins provide stability and direction. Therefore, when stationary, trout always face into the flow. For these reasons (blind spot and instream positioning), fly-fishing in a downstream to upstream direction is a very good strategy.
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