Why profit and cash diverge in optometry.
Optometry cash flow is the timing gap between when a practice earns revenue and when the money is actually available. The gap is created by three things specific to the vertical: optical inventory purchased months before it sells, lab invoices payable before patients pay their balances, and vision plan and medical reimbursement that arrive on different and often lengthening schedules.
Five places optometry cash gets trapped.
- The frame boardOften the largest single working capital position in the practice, and usually invisible on a generalist P&L because frames were expensed at purchase rather than carried as inventory.
- Slow-moving frame linesA board that turns twice a year has roughly six months of cash sitting on the wall. Turns by vendor and by price band is the diagnostic.
- Lab payables ahead of patient balancesThe lab invoice comes due on standard terms. The patient's remainder may age well past that. The practice finances the difference.
- Plan reimbursement lagRoutine and medical claims pay on different clocks, and a shift in payer mix quietly changes your cash cycle without changing your revenue.
- Equipment financingOCT, fundus imaging, and visual field equipment carry monthly obligations that hit cash but appear only partly on the P&L through depreciation.
Inventory is the story
Most practice types don't carry meaningful inventory. Optometry does, and it changes the shape of the whole business. Every frame on the board is cash that was spent and has not yet come back. A practice can post a strong profit and still feel tight simply because it bought deeper than it sold.
The number that makes this visible is inventory turns — how many times the board sells through in a year — tracked by vendor and by price band rather than in aggregate. Aggregate turns hide the problem, because a fast-moving mid-tier line will mask a designer line that hasn't moved in eight months.
This is not an argument for a thin board. It is an argument for knowing what the board costs you, so that the decision to carry a line is deliberate rather than accidental.
Build a thirteen-week forecast, not a monthly one
Monthly cash reporting is too coarse for a business with lab payables, a payroll cycle, and lumpy frame buying. A rolling thirteen-week forecast — expected collections by payer, scheduled payables, payroll dates, debt service, and planned inventory purchases — is the tool that actually prevents surprises.
It also changes how you buy. A practice that can see its cash position eleven weeks out can time a vendor order or a trunk show against the trough instead of into it.
The seasonal pattern nobody plans for
Most optometry practices see a fourth-quarter surge as patients use expiring vision benefits, followed by a slow first quarter. That is predictable, which means it is plannable, and yet it routinely causes stress because the practice spent the December cash before the February gap arrived.
Reserving against a known seasonal trough is one of the simplest and highest-value habits in this vertical, and it requires nothing more than reporting that shows the pattern clearly across prior years.
Frequently asked.
Why is my optometry practice profitable but short on cash?
Usually inventory. Frames purchased and sitting on the board are cash already spent that has not yet come back, and if your books expense frames at purchase rather than carrying them as inventory, that position is invisible on the P&L. Add lab invoices that come due before patient balances are collected and reimbursement lag from plans, and a profitable practice can be genuinely tight.
What is a healthy frame inventory turn rate?
Practices commonly target somewhere in the range of two to four turns per year, but the aggregate number matters less than the breakdown. Track turns by vendor and price band, because a fast-moving core line will mask a premium line that has not moved in months and is quietly holding a large share of your working capital.
How far ahead should an optometry practice forecast cash?
A rolling thirteen-week forecast is the practical standard. It is long enough to see a seasonal trough or a large inventory purchase coming and short enough to be built on real scheduled collections and payables rather than estimates.
Optometry resource center.
Or read the cross-practice version: cash flow in practice accounting →
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