How might an individual lose their sight or their hearing but not have direct damage to their eyes or ears

If they were born that way so what another person said genetics

So if you are born without sight or hearing it wouldn’t be painful or it would not have caused damage rather say if you had something harmful in your eyes another word could be PRE-EXISTING CONDITION.

The proton has a positive charge while the neutron has no charge they both make up the nucleus of the atom while the elections have a negative charge and surround the nucleus of the atom. the protons and electrons are used to calculate the atom's mass whereas the neutrons don't affect the mass