I am a one-eyed pilot, multiengine instrument rated, several thousand hours. I did have a fair amount of trouble with flare height until I developed an alternative method over a period of months, which was to look out the side window and judge closing rate as a matter of timing.. 5-4-3-2-1 . However my instructor would joke that what I really did was point the nose at the numbers and fiddle with the glove box door for 20 seconds or so. One thing that I did accomplish was adherence to glide slope and other instrument procedures, as I became more confident in the IFR environment than VFR.
FYI to get a license with one eye you need a medical flight test with a FAA medical examiner resulting in a waiver..