Dynamic natureofposterior subcapsular cataract

Posterior subcapsular cataract (PSC) intheabsence ofanyotherformoflensopacities isrelatively uncommon.IntheFramingham Study isolated PSC occurred in2-1%ofapopulation aged52to85years old.' PSCoccurina widevariety ofconditions. Eshagian lists 38associations.2 Itshistopathology has beenwelldescribed.35 Quantitative microradiography hasdemonstrated markedshifts inprotein concentration atthejunction ofnormal lens fibres andPSC,creating scattering interfaces.6 PSChave beenstudied bytheScheimpflug slit-image camera. Lenses withPSChavebeenshowntobesmaller than normal andtobeassociated withasmall orabsent anterior clear zone.' However, there doesnotexist toourknowledge anystudy ofthefinemorphological changes that might occur withtimeinPSC.Thepresent study was designed tostudy changes withtimeintheir fine morphology. Lenses with PSCwerephotographed by theprototype Oxford retroillumination camera after