What is a good OSDI score, and how to use it to judge a treatment
Dry eye is unusually hard to judge from the inside. Symptoms swing with the weather, the season, how long you were on a screen and how well you slept, so better and worse stop meaning much. The OSDI exists to turn that into one number you can compare against itself, and once you have it, the question of whether a treatment is working becomes answerable.
The Ocular Surface Disease Index scores dry eye symptoms from 0 to 100. Roughly, 0 to 12 is normal, 13 to 22 mild, 23 to 32 moderate and 33 or above severe. It measures how much your eyes bother you and how much they limit what you do, not what an examination finds. A change of a few points is noise; the shift that counts is larger and depends on how severe you were to begin with.
What the OSDI is, and what it is not
The OSDI is a twelve-question survey covering three things: symptoms such as grittiness and soreness, difficulty with vision-related tasks such as reading or screen work, and how much environments like wind, air conditioning and low humidity affect you. Answers are scored and scaled to a number out of 100, where higher is worse.
It is a symptom measure. It does not look at your tear film, your meibomian glands or the surface of your eye, and it can disagree with what an examination shows in both directions: some people score badly with mild-looking eyes, others score well with significant surface damage. That is a known feature of dry eye, not a flaw in the questionnaire, and it is why your eye doctor uses the OSDI alongside clinical tests rather than instead of them.
The severity bands
| OSDI score | Band | What it usually reflects |
|---|---|---|
| 0 to 12 | Normal | Symptoms are not meaningfully limiting day to day |
| 13 to 22 | Mild | Noticeable, usually manageable, worse in bad environments |
| 23 to 32 | Moderate | Regularly interfering with screen work, reading or driving |
| 33 to 100 | Severe | Shaping how you plan your day |
Most people who describe themselves as having chronic dry eye sit in the moderate to severe range when they first measure it, which is often a surprise, because living with something gradually recalibrates what you think of as normal.
What counts as a real improvement
This is where the number earns its keep. Small week-to-week wobbles are noise. Published work on the OSDI suggests the change that represents a genuine difference is not a fixed number of points: it is larger for people who started out severe and smaller for people who started out mild, and it lands somewhere in the range of roughly seven to fifteen points for most patients.
The practical rule that follows is simple. If a treatment moves your score by two or three points, you have learned nothing. If it moves it by ten or more and holds there across several weeks, that is a real effect and worth keeping.
How to test a treatment against your own score
- Score yourself for two or three weeks before starting anything new, so you know your baseline and how much it naturally wobbles
- Change one thing at a time, which is the step almost everyone skips
- Give it a fair run: warm compresses and lid hygiene need weeks, omega-3 supplements longer, drops act faster
- Keep scoring weekly, at a similar time and in similar conditions
- Compare the new average against your baseline average, not against your worst day
Starting a heated mask, a new drop and a supplement in the same week is the most common mistake in dry eye self-management. If things improve you will never know which one did it, and you will keep paying for all three.
Why environment belongs in the record
Screen time suppresses your blink rate, low humidity accelerates evaporation, and wind and air conditioning both make things worse. These effects are large enough to swamp a treatment effect if you are not watching them. A week of heavy screen work can undo the apparent benefit of something that is genuinely helping, and without the context you will blame the treatment.
What to bring to the eye doctor
An OSDI trend over months, a list of what you have tried with how long you gave each one, and the score before and after. That is a far more useful starting point than trying to recall which drops you used last spring, and it matters when the conversation turns to more expensive options such as prescription drops, punctal plugs or in-office procedures.
Turning the score into a decision
We are building TearLog around exactly this loop: a weekly OSDI, a record of every treatment with the date it started, environment pulled in automatically, and a plain verdict on each thing you try. The point is not to collect data. It is to stop paying for the things that are not working.
Frequently asked questions
What is a good OSDI score? +
Under 13 is generally considered normal. 13 to 22 is mild dry eye, 23 to 32 is moderate and 33 or above is severe. The score runs from 0 to 100 and higher means worse symptoms.
How is the OSDI calculated? +
It is a twelve-item questionnaire covering symptoms, difficulty with vision-related activities and sensitivity to environmental triggers. Each answer is scored and the total is scaled to a number out of 100. It takes a couple of minutes to complete.
How much does an OSDI score need to change to matter? +
Small movements of two or three points are within normal week-to-week variation. A meaningful change is larger and depends on your starting severity, typically somewhere in the range of seven to fifteen points, and it should hold across several weeks rather than appear once.
Can my OSDI score be high if my eyes look normal? +
Yes, and the reverse happens too. Symptom scores and clinical signs in dry eye often disagree, which is well documented. That is why the OSDI is used alongside an examination rather than in place of one.
How often should I take the OSDI? +
Weekly is a good rhythm for tracking a treatment. More often adds noise without adding information, and less often makes it hard to tell a real trend from a bad week.
This article is general wellness information about dry eye disease, not medical advice. Dry eye has several causes and is diagnosed by an optometrist or ophthalmologist; the OSDI is a questionnaire, not an examination. Sudden vision change, eye pain, light sensitivity or discharge needs same-day care from an eye doctor rather than a self-management plan.