An ophthalmic apparatus has an illumination optical system for illuminating a preselected point of a patient’s eye with slit-light. A user such as a software developer can decorate a particular function with an identifier to indicate that the particular function is transaction-safe. The steam boiler may comprise an enclosure with a burner, first and second fluid conveyance members, and one or more radiants therein. Conformal and non-conformal etch techniques can be used according to various implementations. A rotatable member, on which a coupling part coupled with the golf ball is rotatably formed, is received in the receiving hole after being moved along the guide channel. The cover includes a pair of opposite first edges each having a pair of resisting beams extending toward opposite directions and projecting toward the housing.