Some of us need prisms in our glasses. In my case I was flaring late without them, but it's possible the error can go the other way.
When you do your medical, there's a scope you look through that shows a line of white dots against some inverted red L's . If that goes through the middle, you should be OK -- otherwise it's time to visit an optometrist.
Once you can distinguish texture on the ground, such as grass blades or cracks in the asphalt or concrete, it's time to look to the end of the runway to manage your flare as others have already said.
Use your peripheral vision to keep track of the edge of the hard runway, especially if it's narrow, so that the x-wind does not play tricks on you.
The other thing you need to work out is the rate of stick movement that will produce a proper flare. Each a/c will be different and it will also change with the centre of gravity and airspeed. This is where keeping your gaze on the end of the runway will give you pitch feedback on your flare.