Would high light bleach micranthum leaves?

Hello,
I keep my three paph. micranthums on the east facing windowsill. They do get some direct sun there early morning. Lately I started to notice that their beautiful pattern on the adult leaves is not defined as well and sharp as it is on newly coming leaves. Looks sort of bleached. They look healthy otherwise and are growing new leaves.
Could too much light affect the sharpness of the pattern as for example with some tropical plants like marantas?
Thanks a lot.