Performing eye surgery is no simple task. Even with the aid of sophisticated instruments, the slightest miscalculation can cause irreparable damage to the patient's sight. One South Orange surgeon learned yesterday morning, however, that the work is far more difficult when a 4,300-pound SUV comes barreling through the wall during an operation. Bernard Spier was finishing a routine cataract surgery at Northern New Jersey Eye Institute at 8:37 a.m. yesterday when another patient drove his red Toyota 4Runner through the wall, stopping just inches from Spier and the patient lying partially sedated on a gurney in the middle of the...