micron
One Millionth of a Meter
Plain-language definition
A unit of measurement (1/1000 of a millimeter) used for retinal layer thickness on OCT. Normal RNFL is roughly 90-110 microns.
Expanded explanation
micron is the glossary term for One Millionth of a Meter. On a full article page, it should be read as a test or diagnostic term term, not as a stand-alone diagnosis or treatment plan.
Diagnostic terms name tests, measurements, imaging techniques, or exam maneuvers. The name of the test is only the starting point; the result and how it fits the symptoms are what guide decisions.
In eye care context
Diagnostic terms describe tests, measurements, imaging, or exam techniques used to understand eye and neuro-ophthalmic problems.
What to look for around this term
- What the test measures or visualizes and which part of the visual system it evaluates.
- Whether the result is used for diagnosis, severity grading, monitoring, or treatment planning.
- Whether repeat testing, comparison with prior results, or correlation with symptoms is important.
Questions this term may raise
- What does this test measure?
- Was the result normal or abnormal?
- Will this test be repeated to track change over time?
- Category
- Test or diagnostic term
- Also written as
- microns, micrometer, micrometers
Related glossary terms
A note on medical context
A glossary definition can explain a word, but it cannot tell you whether a symptom or test result is serious. If this term came from an article, use the full article and your clinician's guidance for context.