What does this LOINC code represent?

This LOINC code identifies a lab observation, measurement, question, or clinical concept in a standardized format.

Is this enough to understand my test result?

No. The code identifies the test or observation, but the interpretation depends on the actual result, reference range, and clinical context.

LOINCActiveObservation

LOINC Code 99133-1: Near convergence break by Phoropter

Name: LOINC Code 99133-1: Near convergence break by Phoropter
Creator: HealthAssure Clinical Team
Published: 2026-05-21T09:00:33.064Z

99133-1 is a LOINC code used to identify Near convergence break by Phoropter in laboratory and clinical observation data. You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges. LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Near convergence break. It is commonly used with the system or sample type Eye.

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

What is this code?

LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Near convergence break. It is commonly used with the system or sample type Eye.

When is it used?

Used in lab systems, EHRs, and clinical data exchange.
May identify a test, observation, survey item, or clinical document request rather than a diagnosis.
Status: ACTIVE
Order vs observation: Observation
Method: Phoropter

What it does not mean

The code identifies the observation or test, not the actual result.

Key facts

Near convergence break by Phoropter
Near convergence break
by Phoropter; EYE.REFRACTION; Eyeball; Inverse Length; Near con break; Occular; Oculis; Ophthalmologic; Optic globe; Point in time; QNT; Quan; Quant; Quantitative; Random; Vision; Visual

Where you may see this code

You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges.

Common synonyms

Near convergence break by PhoropterNear con break by PhoropterNear convergence breakEYE.REFRACTIONInvLenPtEye

Frequently asked questions

Code details

Code99133-1

SystemLOINC

Display nameNear convergence break by Phoropter

DescriptionNear convergence break

Short nameNear con break by Phoropter

ComponentNear convergence break

PropertyInvLen

TimingPt

System (specimen)Eye

ScaleQn

MethodPhoropter

ClassEYE.REFRACTION

Example unitsdiopter

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.72

Last changed2.72

Part names

Near convergence breakInvLenPtEyeQnPhoropterInverse LengthPoint in time (spot)

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from LOINC. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.