Marfans syndrome is a connective tissue
disease characterized by clinical features like abnormally tall, long slender fingers, high arched palate. They can have eye features like myopia
, subluxation of lens, glaucoma
and so many...
He needs to undergo eye examination by a eye doctor to look for all these eye problems. He also needs to undergo examination by a physician or by cardiologist to find out associated cardiovascular problems.
I think good glasses in this context is glasses with correct refractive error
, since he has got high myopia and he needs to wear it regularly to prevent complications.