You have type 2 diabetes, an eye exam you have been putting off for two years, and a weight-care evaluation about to start. The two subjects do not obviously touch — one is your eyes and one is your weight — and nobody at either end has raised the other with you. They touch in one place: the labeling for the medicines a weight-care evaluation can end in carries a warning about the eye, and what it asks for is an appointment rather than a symptom to watch for. You can put the exam on the calendar today, and you can tell the vision changes worth a same-day call from the ones that wait.
The exam is due on its own schedule, independently of anything to do with weight: a comprehensive dilated eye exam at least once a year for anyone with diabetes, and for type 2 the yearly exams start right after diagnosis. Two years puts you overdue on that alone. Starting weight care adds a second reason to clear the backlog now rather than later: the warning in that labeling turns on whether you have a history of diabetic retinopathy, and only an exam answers that.
Why your eyes come up at a weight appointment
Two sentences in the labeling for medicines in this class are what put an eye appointment beside a weight one. Rapid improvement in glucose control has been associated with a temporary worsening of diabetic retinopathy. And patients with a history of diabetic retinopathy should be monitored for progression of it.
Diabetic retinopathy is damage to the blood vessels at the back of the eye. It is watched on a schedule rather than reported by the person who has it, because the early stages usually don't have any symptoms. So watching your own vision does not find it early. An exam does.
Whether you have a history of diabetic retinopathy is a fact an eye doctor establishes and writes into your record, and it is the fact that warning turns on. After two years the honest answer to it is that nobody has checked lately, and that is what you tell the clinician prescribing for you until an exam replaces it with something better.
How often the exam is due, and what the eye doctor is looking at
At least once a year is the interval for anyone with diabetes, and what an eye doctor checks in it is the blood vessels at the back of the eye. For type 2 the count starts at diagnosis rather than at some later stage. Some people who already have diabetic retinopathy need one as often as every 2 to 4 months, which is a decision an eye doctor makes from what they see, not one you can arrive at from how your vision feels.
The appointment itself is short. You get drops to dilate the pupil, and the doctor then checks the eye for diabetic retinopathy and other eye problems. The drops are what makes the day need planning: your vision will be blurred afterward, they usually wear off in several hours, and the instructions that come with them are to wear sunglasses and to have someone drive you home.
Pregnancy moves the timing. Women with type 1 and type 2 diabetes need an eye exam before pregnancy or within the first 3 months of it, so if pregnancy is on the table this year, that timing belongs in the same call rather than in a later one.
Vision changes that mean calling today
Some vision changes are worth a call the same day, ahead of any appointment already booked. Call an eye doctor right away if you notice sudden changes to your vision, including flashes of light or many more spots, called floaters, than usual. A curtain pulled across your vision is not on that same-day list: NIDDK says to see a doctor right away, and calls it a possible sign of a medical emergency.
All of those are sudden. A change that has been drifting slowly for months belongs at the booked exam instead, so write it down the week you notice it and describe it there, rather than reconstructing it in the chair.
The call, the exam, and the ride home
- Call an eye doctor's office and ask for a comprehensive dilated eye exam. Say you have type 2 diabetes and that your last exam was two years ago.
- Give the date to the clinician handling your weight care once you have it, and say whether you have ever been told you have diabetic retinopathy.
- Plan the day around the drops: arrange for someone to drive you home, and take sunglasses with you.
- Ask before you leave when your next exam falls due. For most people with diabetes that is a year; for some with diabetic retinopathy it is every 2 to 4 months.
- Say at the booking if you are pregnant or planning to be this year, because the exam is due before pregnancy or within the first 3 months.
- Call the same day, ahead of the booked appointment, for sudden vision changes, flashes of light, many more floaters than usual, or a curtain across your vision.
Two years is a long time for something that changes without showing anything. Ending that is one phone call to an eye doctor, and the date is the only part of it you have to decide.
