If you mean to say branded means imported then I may clarify that there are Indian brands which are not bad but are much economic .

Hello Branded are always better in quality than local ones For this high power... High index glasses are recommended You may also think about contact lens or lasik

Definitely there is a difference. Quantity of vision doesn't differ but quality differs. The clarity will be uniform throughout in branded ones ,less aberrations and less eye strain or discomfort or headache. For high power high refractive index Glasses are useful ,less weight, easy to wear and less marks over the nose. Material is different 1.59 made up of polycarbonate tough to break byAccidental drop.