The lack of information provided by a French opthalmologist is deliberate, to force you, the customer, to go back to them (if you're looking for contact lenses in particular), or to a French optometrist who can read it and knows how to fill in the blanks.
Thankfully, most French optometrists will now (if you ask them) provide you with a more details if you buy your first pair from them.
The French system deliberately protects the opthalmic consultants (as a result of their intense lobbying) - one of the banes of my existence since I have lived here. "Vive le jour où ce marché sera libéré" - I await that day with a vengeance. It is coming, but the rearguard are fighting with all they've got.
You can already buy specs and contact lenses online in France, but it still pays to go and pay a visit to one of the local optometrist shops just to make sure you get the right fittings. Companies like Grand Optical and I think even Leclerc now are pushing prices ever lower and increasing their service offerings, without infringing the sacrosanct law on the practice of medicine.