We image optical singularities by exploiting the connection between scalar and vector fields. We examine the sensitivity of optical vortices to perturbations and suggest a method of study via imaging polarimetry of the optical field. This is possible by converting optical vortices to polarization-singularity C-points. We present the deliberate creation of C-points using a superposition of two circularly polarized beams of opposite helicity, with a phase vortex in one and a planar wavefront in the other. We present a theoretical analysis and measurements of the transformation of C-points from lemon to star, going through the monstar stage. We do this by varying the phase gradient of the optical vortex. © 2013 SPIE.