<prompt> The most common ophthalmic effect of diptheria is -PtosisTotal ophthalmoplegiaIsolated ocular palsiesOphthalmoplegia externa  <response>: Ans. is c i.e., Isolated ocular palsies Complications o Obstruction of the respiratory tract by pseudomembrane o Myocarditis Polyneuropathy Post diphtheritic paralysis q Occurs in the 3rd or 4th week o Palatine and pupillary paralysis is characteristic Spontaneous recovery is the rule. Pneumonia o Other less common complications are renal failure, encephalitis, cerebral infarction, pulmonary embolism and bacteremia or endocarditis. 