Eye Drops / Dilating Eye Drops and Testing (Patient Information)
During your eye exam, your doctor may use dilating eye drops and perform additional ophthalmic tests to examine the back of your eyes.
Dilating drops enlarge the pupils so your ophthalmologist or optometrist can get a better view inside your eyes. Temporary effects can include blurred near vision and increased sensitivity to light. How long these effects last varies by person and drop type and may be anywhere from 2–6 hours (sometimes longer). Your doctor cannot predict exactly how you will be affected.
Safety tips
- Bring sunglasses; we can provide disposable shields if needed.
- Use caution when driving or operating machinery after dilation. If you feel unsure, arrange a ride or wait until your vision clears.
- Tell your doctor if you’ve been told you have narrow angles/glaucoma or if you’ve had a reaction to dilation drops.
Rare risks
In very rare cases, dilation can trigger a sudden rise in eye pressure (acute angle-closure). Seek immediate care or call 911 if you develop severe eye pain, headache, nausea, halos around lights, or suddenly worsening vision after dilation.
Dilating eye drops are an important part of diagnosing many eye conditions and help ensure a thorough examination of your eye health.
This information is for education only and does not replace advice from your eye-care professional. For medical emergencies, call 911.