Tracking patching: how do you know how much was done?

The most common question at a check-up is this: how long did they wear it? The answer usually comes from memory, and without anyone being at fault it lands above the truth. Remembering days across months of treatment is not what human memory is for.

This article covers why tracking is part of the treatment, and what a useful record looks like.

Family diaries have repeatedly been found to overstate the real time when compared against sensor measurements. This is not a question of honesty: recalling how a day went by the evening, let alone weeks later, is not reliable.

Seen through objective measurement the picture is clear: in a group prescribed six hours a day the dose actually delivered averaged 4.2 hours, and in a group prescribed twelve it averaged 6.2. Across the wider literature adherence sits at roughly 40 to 60 per cent.

In patching the gain accumulates with total time. Hours that go missing come straight off that total; the treatment does not look like a failure, it simply moves more slowly than expected.

That distinction matters clinically. When a doctor sees slow progress there are two very different possibilities: the method may not be working well for this child, or the method may never have been applied enough. Without a real record the two cannot be told apart.

A total in minutes is not enough on its own. A useful record holds three things together: how long it was applied, which eye was covered, and how that time was spread across the week.

The spread is its own piece of information. One long day a week and a little every day can add up to the same total without being the same thing, and it changes the picture the doctor is looking at.

Which eye was covered is worth recording too. Covering the wrong eye is a mistake that happens in practice, and until it is noticed the time spent adds nothing to the treatment.

At home a record takes the argument out of memory. How a week went is not guessed at, it is looked at, and a week that went badly stops being something to blame anyone for.

For the doctor, a record makes it possible to review the plan against real data. Raising the time, lowering it, changing the method or carrying on as before: each of those decisions rests on firmer ground once it is known how much was actually done.