in paediatric victims with neurofibromatosis type 1 and optic pathway gliomas the opportunity of seen loss is established on the extent and place of the tumor by using way of magnetic resonance imaging and is particularly associated with involvement of postchiasmal structures. involvement of the optic tracts and one-of-a-kind postchiasmal constructions at tumor prognosis was once as soon as associated with a substantially increased probability of visible acuity loss. moreover older age at some stage in early life does now no longer keep away from the occurrence of visible loss. shut follow-up beyond the early childhood years particularly for those with postchiasmal tumor is recommended. the analyze about showed that at the 4-year examination the microtropes have been detected. microtropia frequently remains not noted by way of way of the parents and this indicates the magnitude of performing a seen acuity take a appear at to become aware of these children. after the age of 4 very few cases of strabismus have been detected which is additionally a sign of the effectiveness of the screening device at the formerly ages. the complete incidence of strabismus was once as soon as 3.1% and happen strabismus used to be seen in 2.7% of the children. this is in accordance with extraordinary authors who have said an incidence of 3.1%–6.7% frandsen 1960; graham 1974; kornderet et al. 1974; laatikainen et al. 1980; ladenvall 1988; preslan et al. 1996; rantanen and tommila 1971 esotropia is almost three times as frequent as exotropia in this find out about which is a greater ratio than has been discovered in other nordic nations laatikainen et al. 1980; rantanen and tommila 1971 on the other hand the percentage found in the locate out about might also additionally now not reflect the genuine incidence of hyperopia due to the reality that many of the kids with slight hyperopia 2–4 d may also moreover now no longer have reduced visible acuity or any different seen hassle and subsequently go unnoticed. refractive mistakes have been often detected at the age of 4 when the first visible acuity take a look at used to be as soon as performed. the 5.5-year examination also detected a few youngsters with refractive errors. out of the young people with refractive mistakes 73.1% had been located before the age of 6 years. after 6 years very few anisometropias or strabismic with ametropia had been discovered.