Astigmatism Refracting, Prescribing and Consulting

What age range has little change in astigmatism?

6-16 yr

There is an increase in what type of astigmatism beyond 35 yrs?

ATR (0.20D per 10 years)

What are the hallmark symptoms of astigmatism?

distance blur, near blur, eyestrain, double vision

What are signs of astigmatism?

asymmetric motion on ret, corneal toricity, cataracts, trauma, pterygium, ptosis, keratoconus

What amount of astigmatism at an early age can be amblyogenic if uncorrected?

1.50DC

When should you recheck an astigmatic patient that is 2-6 yrs old?

3 months

What astigmatic correction is recommended for younger patients?

full correction, full-time wear

In adults, be wary of prescribing a change of more than what amount of cyl?

0.75 DC

Frame Selection for Astigmatism

smaller (less peripheral distortion), pupil close to geometric center, more rounded frames (but not perfectly round)

How do you refract irregular astigmatism?

dilate pupil before refracting, check pinhole acuity, refract using large steps