These are low level entry jobs for people looking for a start in healthcare.
The training is extremely short and cheap. and online/distance study
According to the occupational Outlook Handbook The median annual wage for physical therapist aides was $23,880 in May 2012.The median annual wage for occupational therapy aides was $26,850 in May 2012.The median annual wage for opticians was $33,330 in May 2012.The median annual wage for veterinary assistants and laboratory animal caretakers was $23,130 in May 2012.
The job outlook is expected to be good in all these areas.

Ed to go offers very short and inexpensive courses that are billed "Become a Physical therapy aide, optical assistant, veterinary assistant, a legal nurse consultant and others that are billed as "exploring a career" such as Pharmacy technicians and other fields.Some as low as (95 dollars)

Course Catalog - ed2go online course - Online adult & continuing education provider

Pennfoster had programs in OT aide.PT aide, dental assistant , pharmacy technician, optician and veterinary assistance -less than 6 months and some as low as 350 dollars.

Online Diplomas and Career Training | Penn Foster

and Expert -rating training offers online training and certification exams in Physical therapy aides, optical assistant and veterinary assistant for 129.99

ExpertRating - Courses, Tutorials and eBooks