insulin affects your vision because insulin lowers blood glucose levels which in turn effects the lens of the eye not because insulin has a direct effect on your eyes. when your blood glucose (sugar) levels go up fluid enters the lens of your eyes and when your blood glucose goes down the fluid shifts out of your lens. these changes in fluid in the lens cause blurred vision so both high and low blood glucose levels affect your vision. as your blood glucose levels stabilize on insulin these shifts become less and your vision improves. so be patient. in most cases the blurry vision after you start insulin settles down. usually these vision changes resolve within a few days or weeks depending on how quickly your diabetes comes under control. after examining your eyes your doctor will be in good position to hopefully reassure you that these vision changes are temporary. therefore unless you are really having serious vision problems wait until your blood glucose levels settle before having your vision tested for a new pair of glasses.
does the use of insulin affect your eyes?