Horses that benefit from an "Inside" Blinker

When people talk about a racehorse needing a blinker on the "inside" to keep him straight, what side are they talking about?

Answer:

One-eyed, or extension blinkers, are usually employed when a horse has a tendency to hang to the left or right during a race.

The blinker cup is employed on the side the horse veers towards and effectively keeps them running in a straight line.

If the horse veers towards the inside of the track (either left or right) then the blinker will be employed on the "inside."

A jumps horse that displays this tendency will often be run on courses that turn in the direction the horse jumps out to.