▁able ▁to ▁describe ▁the ▁world ▁compared ▁to ▁a ▁normal ▁sight ed ▁person . ▁For ▁instance , ▁Michael ▁would ▁have ▁trouble ▁differenti ating ▁complex ▁shapes , ▁dimension ▁and ▁orient ations ▁of ▁objects . ▁Hann an ▁( 2 0 0 6 ) ▁hypoth es ized ▁that ▁the ▁temporal ▁visual ▁cor tex ▁uses ▁prior ▁memory ▁and ▁experiences ▁to ▁make ▁sense ▁of ▁shapes , ▁colours ▁and ▁forms . ▁She ▁proposed ▁that ▁the ▁long - term ▁effect ▁of ▁blind ness ▁in ▁the ▁visual ▁cor tex ▁is ▁the ▁lack ▁of ▁recognition ▁of ▁spatial ▁c ues . ▁ ▁At ▁ 3 ▁years ▁of ▁age , ▁Michael ' s ▁vision ▁had ▁still ▁not ▁reached ▁the ▁ac u ity ▁of ▁an ▁adult ▁person , ▁so ▁his ▁brain ▁was ▁still ▁not ▁completely ▁exposed ▁to ▁all ▁possible ▁clar ity ▁of ▁images ▁and ▁light ▁of ▁the ▁environment . ▁This ▁made ▁it ▁difficult ▁for ▁Michael ▁to ▁lead ▁a ▁normal ▁daily ▁life . ▁C ohen ▁et ▁al . ▁( 1 9 9 7 ) ▁suggested ▁that ▁early ▁blind ness ▁causes ▁a ▁poor ▁development ▁of ▁the ▁visual ▁cor tex ▁with ▁the ▁result ▁of ▁a ▁decrease ▁in ▁som atos ens ory ▁development . ▁This ▁study ▁proposed ▁that ▁Michael ' s ▁long - term ▁blind ness ▁affect s ▁his ▁ability ▁to ▁distinguish ▁in ▁between ▁faces ▁of ▁males ▁and ▁females , ▁and ▁to ▁recognize ▁pictures ▁and ▁images . ▁In ▁spite ▁of ▁the ▁surg ery ▁on ▁his ▁right ▁eye , ▁his ▁newly ▁reg ained ▁vision , ▁after ▁blind ness ▁of ▁forty ▁years , ▁is ▁not ▁fully ▁recovered . ▁Th inus - Bl