Maggi,
There are new recommendations by the NTSB regarding eyesight standards following a serious accident.
While the FAA usually disegard these recommendations it would be possible for clever use of the media to result in tightening up standards towards the JAA ones. Please tread very carefully in terms of financial outlay until you've seen an American examiner and found what class of licence you could qualify for and whether your particular deficiency might be involved in the calls for higher standards.
Regards
Rob Lloyd