Final answer:
Light-pearly nodules can refer to conjunctival nodules or Nostoc masses.
Step-by-step explanation:
The light-pearly nodules mentioned in the question are most likely referring to two different biological structures: conjunctival nodules and Nostoc masses.
Conjunctival nodules are dome-shaped structures that can occur during inflammation of the conjunctiva. They are red at the base and pale on top.
Nostoc masses, on the other hand, are irregular gelatinous masses formed by the cyanobacteria Nostoc. These masses can sometimes take the form of spherical balls ranging from 5 to 20 mm in diameter.