The Heidi fixation targets were designed for standardization of the test situation. It is now possible to easily define the size of the fixation target and the distance where the child can fixate and follow it.
Accommodation is a motor function that is often forgotten in the assessment of infants and children.
It is assumed that they have normal accommodation although it should be known that accommodation may be poor in visually impaired children and children with other motor disorders, especially cerebral palsy. In infants and young children accommodation can be measured only by using objective technique of dynamic retinoscopy . In the examinaton of older children it is possible to use visual acuity tests to assess accommodation . If visual acuity at distance is better than visual acuity at near because of poor accommodation, the use of reading addition increases visual acuity at near. There does not need to be total lack of accommodation.