Rosette shaped cataract is seen in -
Trauma
Radiation
DM
Iridocyclitis
Concussion cataract occurs mainly due to inhibition of aqueous and partly due to direct mechanical effects of the injury on lens fibres. Following types of cataract occurs :- i) Discrete subepithelial opacities; ii) Early rosette cataract (punctate); iii) Late rosette cataract; iv) Zonular cataract; v) Diffusion cataract; vi) Early maturation of senile cataract.