<prompt> A child with a unilateral white reflex raised IOP. The required investigations are:USGObservation under anesthesiaTonometryAll  <response>: ALL Investigations for Leucocoria - Examination under anaesthesia X Ray-orbit, UltrasoundQ, CT scan to look for calcification size, and extent of tumor MRI to rule out ectopic intracranial retinoblastoma optic nerve involvement. LDH level is raised in aqueous Measurement of IOP by Tonometry Distant metastasis is suspected by CSF examination lumbar puncture, bone liverspleen scan, bone marrow aspiration biopsy etc 