The eyes of tye horse should be in the middle of the blinkers.
The blinkers should be far enough away from the eye that no part of the eye toughes the blinkers, eyelashes included.
These first photos shows good placement the blinders. DSC01648.jpg DSC01665.jpg
This next photo show the blinders in good placement but, I feel, the blinders are too close to the horses eyes. DSC01657.jpg
To correct the closeness of the blinders to the horses eyes you can pull out the blinder stays by hand,( the better bridles have wire in the stays).
Or adjust the buckle on the crown piece between the horses ears.
If you tighten the buckle it will pull the blinders in closer to the horses eyes. If you loosten the buckle it will move the blinders further from the horses eyes.
In this photo there is wire in the stays, so I adjusted one blinder away from the eye and left one blinder close to the eye. I hope you can tell which is which. DSC01659.jpg