Data validation systems and methods are provided. The retaining ring features a pad engaging surface which is designed to be flat and planar when the retaining ring is mounted to a carrier of the CMP apparatus. The control system for the elevators is equipped with a landing call registration device, a landing call automatic registration portion, a response selection portion, a passenger traveling time period calculation portion, and an openingclosing control portion. A cylindrical syringe body shape facilitates control over the needle bevel orientation during injection of the implant into the eye. 6 wt % of the total composition of a group III or group IV metal salt or combination thereof; and ii) a charged polymer; and iii) a silicone; in which the composition has a pH of 4 or below at 20\xb0 C. A battery housing comprises a cylindrical tube with a short longitudinal slit therethrough.