I was unaware of ophthalmologists' being unable to sell eyeglasses in Quebec. In the United States, ophthalmologists are not restricted from any practice in which an optometrist may engage, irrespective of whether the former chose actually to engage in it (e.g., contact lenses, vision therapy, low vision devices). In other words, a doctorate of optometry legally enables one to do certain things (e.g., prescribe eyeglasses, contact lenses, and pharmaceutic agents; examine the eyes), however none of these is off-limits to an ophthalmologist.