If an employee has a permanent disability or has sustained a permanent injury that resulted from serving in the United States Armed Forces or in another employment other than that in which he receives a subsequent permanent injury by accident, such as specified in Section 42-9-30 or the second paragraph of Section 42-9-10, he shall be entitled to compensation only for the degree of disability which would have resulted from the later accident if the earlier disability or injury had not existed, except that such employee may receive further benefits if his subsequent injury qualifies for additional benefits under Section 42-9-35.
S.C. Code § 42-9-150