This manual is essential preparation for the COA certification exam. Over 750 questions are included covering all of the topics addressed on the exam, such as measuring & recording acuity, lensometry, ocular dressings & shields, tonometry, instruments, & the A-scan, just to name a few. Score yourself on tough questions that could be on the exam. Explanatory answers are given so that the reader is able to completely understand the reason for the correct answer. Study & test taking strategies are also provided, along with suggestions for additional reading.