Hi,

There are lot and lot of job opportunities for Optometrists in hospitals, Optical Industries, solo or group practice, in Universities and research areas. Optometrist are now also working as a Eye care managers.
So in short you are an Optometrist don't worry for your job.
Few things you have to keep in mind if you want to be extremely success in this field.

Get a good clinical and theoretical knowledge.

Your Marks doesn't matter, only your skills

Attitude alone won't help, Aptitude is most important.

Keep improving your skills

Groom your self very well.