  CSL1 is a peculiar object discovered in the OACDF. Photometric and
spectroscopic investigation strongly suggest that it may be the first case of
gravitational lensing by cosmic string. In this paper we derive and discuss a
statistical excess of a gravitational lens candidates present in OACDF region
surrounding CSL1. This excess cannot be explained on the basis of conventional
gravitational lens statistic alone, but is compatible with the proposed cosmic
string scenario.
