Special circumstances require compounds known as cycloplegics to be used. Chemical names of the cycloplegic drops are atropine, cyclopentolate, homatropine, and scopolamine. Mydriatic are fast acting compounds and dilation of the pupil occurs in 20 to 45 minutes. Patients with light-colored eyes dilate faster than those with dark eyes. Depending on an individual's sensitivity to the dilating drops, the effects may last 2 to 6 hours.
Most people experience mild visual side effects while dilated.
Typically individuals experience a blurring of near vision and increased sensitivity to light. Distance vision is usually less affected by dilation than near vision. Driving while dilated is generally not dangerous, however some people feel safer having a driver. Wearing sunglasses is very helpful in relieving the visual side effects of dilation.