The nurse is assessing a 4-year-old child's visual acuity. He is planning to attend preschool next ...

The nurse is assessing a 4-year-old child's visual acuity. He is planning to attend preschool next week. The results indicate a visual acuity of 20/40 in both eyes. The child's father asks the nurse about his son's results.
 
  Which response, if made by the nurse, is correct? a. Your child will need a referral to the ophthalmologist before he can attend
  preschool next week.
  b. Your child's visual acuity is normal for his age.
  c. The results of this test indicate your child may be color blind.
  d. Your child did not pass the screening test. He will need to return within the next
  few weeks to be reevaluated.