Stephen Trokel. NASA will now accept candidates that previously failed the vision tests. Dello Russo as one of the pioneers of the excimer laser and the down-up technique. Delarusso as one of the pioneers of the excimer laser and the down-up technique. Delarusso as one of the pioneers of the excimer laser and the down-up technique. Delarusso as one of the pioneers of the excimer laser and the down-up technique. Delarusso as one of the pioneers of the excimer laser and the down-up technique. Delarusso as one of the pioneers of the excimer laser and the down-up technique. Delarusso as one of the pioneers of the excimer laser and the down-up technique. Delarusso as one of the pioneers of the excimer laser and the down-up technique. Delarusso as one of the pioneers of the excimer laser and the down-up technique. Delarusso as one of the pioneers of the excimer laser and the down-up technique. Delarusso as one of the pioneers of the