I also recommend trying the grip when choosing a curler. It should fit perfectly in your hand and the handling should be really comfortable (otherwise you will quickly abandon using them). As far as the material is concerned, it should be hypoallergenic metal and high quality silicone, after all you are almost touching your eyes with the curler. From my own experience, I recommend the trusty classic from Tweezerman.
Why curl your lashes
Human eyelashes are like hair, only very fine and delicate. They are attached to your eyelid, and when you curl them, pull lightly on the skin, the eye opens and the eyelid lifts. This effect is especially noticeable in those with more mature skin around the eyes or those with droopy eyelids. You can then fix the curl with mascara, which is applied mainly at the roots (and less at the ends, so that the ‘mascara’ does not fall off). And you're done.
So before venturing into false eyelashes or other solutions, try a curler. You may just be surprised at how beautiful your lashes really are.