The PPL will certainly help you during the cadet training. I checked out this school in YVR and they recall one female student who drop out of the cadet program because it was too intensive and enroll in a PPL program. She reapply and successfully finished the training and was hired by CX. Also, it seem that most applicant hopefuls do have a PPL or planning to do a PPL. However, from reading the posts here, they also look for crew management skills, aka team work. As for your eyesight, they say as long as you can correct it with lenses and pass the medical you be fine. May be you should contact CX and ask.