Why an eye exam is more than a vision test
A vision screening tells you whether you can read a chart. A comprehensive exam tells you why, and whether the eye is healthy. Glaucoma, diabetic retinopathy, macular degeneration and early cataract all develop without symptoms, and the exam is how they are found while treatment can still protect sight. The eye is also the one place in the body where blood vessels and nerve tissue can be seen directly, so the exam sometimes finds signs of diabetes, high blood pressure or other conditions before they are diagnosed elsewhere.
What happens, step by step
- History: your symptoms, your general health, medications, family history of eye disease, and how you use your eyes
- Vision: with and without your current glasses, at distance and near
- Refraction: your prescription, measured with the phoropter and confirmed with your responses
- Eye movements, alignment and pupil reactions
- Eye pressure, screening for glaucoma
- Slit lamp examination of the lids, lashes, tear film, cornea, iris and lens
- Dilation with drops, then examination of the lens, vitreous, retina, macula and optic nerve
- Imaging when indicated: OCT of the macula or optic nerve, retinal photography, corneal topography
- A discussion of the findings and a plan: glasses or contacts, treatment, referral, or simply a date for the next exam
How often
Adults without symptoms or risk factors: a baseline exam at 40, then every two to four years from 40 to 54, every one to three years from 55 to 64, and every one to two years from 65. Anyone with diabetes, glaucoma risk, high myopia or a family history of eye disease: sooner, at the interval the doctor sets, often yearly. Contact lens wearers: yearly, with a contact lens evaluation. Anyone with symptoms: promptly, regardless of the schedule.
Dilation
Dilating drops widen the pupil so the whole retina can be examined; without them only the central retina is visible. They take about twenty minutes to work and last several hours, during which near vision is blurred and light is uncomfortable. Bring sunglasses and consider a driver. Dilation is part of the comprehensive exam at the intervals above and of any exam where the retina needs a careful look.
Insurance
A comprehensive exam is usually billed to medical insurance when there is a medical reason, such as a symptom, a condition or a risk factor; routine vision checks and glasses are covered differently. Our team will confirm your coverage when you book.
Is this right for your eyes?
Nothing on this page is a diagnosis. Whether this is the right choice for you is decided by a full examination at one of our 4 offices: Pasadena, Huntington Beach, Woodland Hills and Beverly Hills.
About this content: This page was written with the assistance of AI tools and reviewed for medical accuracy by Dr. Bavand Youssefzadeh, DO. It is general information, not medical advice, and does not replace an eye examination. Individual results vary. Read our medical disclaimer.
