Visual impairment in children with a brain tumor: a prospective nationwide multicenter study using standard visual testing and optical coherence tomography (CCISS study)

Table 2 Overview of age based ophthalmological assessments for study purpose

Primary outcome measures	Ophthalmological testing methods
	0.5–2 years	2–3 years	3–5 years	≥ 6 years
Visual acuity	TAC	KP	E- charts	Numeral/Snellen charts
Visual fields	BEFIE	BEFIE	BEFIE	Peritest, HFA 24–2 SITA-FAST, Goldmann Perimetry
Thickness of retinal layers (RNFL, GCL-IPL)	Handheld OCT	Handheld OCT	Handheld OCT	Table-top OCT

BEFIE Behavioral Visual Field Screening test, GCL-IPL ganglion cell layer – inner plexiform layer, HFA Humphrey Visual Field Analyzer, KP Kay Pictures, OCT Optical Coherence Tomography, RNFL retinal nerve fiber layer, TAC Teller Acuity Cards

ISSN: 1471-2415