---
title: The Device reports an invalid measurement or asks for the test to be repeated. What causes this?
description: Repeat an OPTOVERA test if blinking, closed eyes, movement or an interrupted cycle prevents a valid pupil recording. Follow the correct technique.
---

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# The Device reports an invalid measurement or asks for the test to be repeated. What causes this?

## Blinking, eye position, movement, or an interrupted cycle can prevent valid capture.

The Device needs a clear view of the pupil during the 4-second video capture. A measurement may be invalid when:

- the User blinks or closes the eyes during the capture;
- the eyes are only partially open;
- the gaze is not centered, or the User looks to the side;
- the User moves the eyes quickly from side to side;
- the Device is moved or removed before the Scan is complete;
- the test cycle is interrupted.

Correct the cause and repeat the test until a valid measurement is obtained.

An invalid measurement is not an Alteration Detected result. It means only that the Device could not capture a valid pupillary response.

![Invalid-measurement screen reporting insufficient pupil visibility during the Scan.](https://knowledge.sobereye.com/hubfs/knowledge-base-optovera/a-q15-medicion-invalida-EN.png)

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