  In non-minimally coupled effective gravity theories one can have
non-topological solitonic solutions. A typical solution is a spherical region
with $G_{\it eff}=0$ outside and having the canonical Newtonian value inside.
Such a spherical domain (gravity-ball) is characterized by an effective index
of refraction which causes bending of light incident on it. The gravity ball
thus acts as a spherical lens. We consider the gravity ball to be of a size of
a typical cluster of galaxies and show that even empty (without matter) gravity
ball can produce arc-like images of the background source galaxy. In case of
background random galaxy field the ball produces distortions (`shear') of that
field. We also obtained constraints on the size of the large gravity ball,
which can be inferred from the existing observations of clusters with arcs.
