Trade encourages specialisation, which brings prosperity; global capital markets, for all their problems, allocate money more efficiently than local ones; economic co-operation encourages confidence and enhances security. Yet despite its obvious benefits, the globalised economy is under threat.
RA (the most common disease cause) and Paget disease of the cervical spine can cause atlantoaxial dislocation or subluxation, basilar invagination, or platybasia. Metastatic tumors that affect bone can cause atlantoaxial dislocation or subluxation.
In general, a chalazion does not affect sight. Rarely, the lump itself is large enough to distort the ocular surface and cause blurring of the vision. The vision will return to normal once the chalazion gets smaller or is removed.