* a) There is a shift in peak spectral sensitivity from 555 nm to 505 nm with dark adaptation

* b) Rods are more sensitive than cone during dark adaptation

* c) Biphasic changes only occur in retina, which processes both rods and cones

* d) Its takes about 30 seconds in man

* e) It is delayed in-patient with vitamin A deficiency

Answer a. T b. T c. T d. F e. T