Yes, but it doesn't matter if the ray is going up or down or left or right, as long as the angle from the normal is the same. This is because the lens in the ey

Yes, but it doesn't matter if the ray is going up or down or left or right, as long as the angle from the normal is the same. This is because the lens in the eye is circular, and the image that results on the retina is the same. So three dimensions: two for position and one for "amount of off-axisness".