"Against the rule"refers to the corneal astigmatism when
A) the horizontal meridian is flatter than the vertical meridian.
B) the horizontal meridian is steeper than the vertical meridian.
C) the corneal astigmatism from the eye differs from that of the refractive cylinder of the prescription.
D) none of the above.
Correct Answer:
Verified
Q6: Which of the following keratometry readings is
Q7: Conventionally, the first number in a written
Q8: If a patient has had refractive surgery,
Q9: To ensure accuracy, the keratometer must be
A)periodically
Q10: What part of the cornea does the
Q12: The keratometer measures
A)the refractive error of the
Q13: The Goldman Applanation Tonometer measures what?
A)Intraocular pressure
B)Corneal
Q14: The normal range of intraocular pressure is
Q15: The tonometer tip can be disinfected by
A)soaking
Q16: Ophthalmic assistants are responsible for calibrating the
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