Ptosis surgery lifts the edge of the lid with respect to the eye and will make the eyes appear more open or "bigger". This is delicate surgery which is best performed through a skin incision and not from the back of the lid. From the anterior approach, the surgeon has complete control of the lid position, lid contour, lid symmetry, lid folds, and eyelash position. The incision lines heal beautifully and are virtually invisible if you are healthy and take care of your skin. My patients often ask if they will have a scar - the answer is yes, you will have a scar any time you have an incision. However, a well-placed incision in the eyelid crease will be hard to find after healing when appropriate surgical techniques are used, and good healing occurs. With regard to the iris - the size of the ocular structures do not change but more of the iris is exposed to view after ptosis surgery. Experienced ptosis surgeons will avoid placing the lid level too high - you would not want your upper sclera to be visible as that would create a "stare" appearance. Best wishes with your decisions.