LOINC

LOINC Code 64859-2: How would you rate your eyesight now, with glasses or contact lens on, if you wear them [PhenX]

64859-2 is a LOINC code used to identify How would you rate your eyesight now, with glasses or contact lens on, if you wear them [PhenX] 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 How would you rate your eyesight now, with glasses or contact lens on, if you wear them. It is commonly used with the system or sample type ^Patient.

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 How would you rate your eyesight now, with glasses or contact lens on, if you wear them. It is commonly used with the system or sample type ^Patient.

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: TRIAL
  • Method: PhenX

What it does not mean

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

Key facts

  • How would you rate your eyesight now, with glasses or contact lens on, if you wear them [PhenX]
  • How would you rate your eyesight now, with glasses or contact lens on, if you wear them
  • Scale of from 1 to 10, where zero means the worst possible eyesight, as bad or worse than being blind, and 10 means the best possible eyesight
  • Cnt; Count; Number; Ordinal; Point in time; QL; Qual; Qualitative; Random; Rate eyesight now; Screen

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

How would you rate your eyesight now, with glasses or contact lens on, if you wear them [PhenX]Rate eyesight now PhenXHow would you rate your eyesight now, with glasses or contact lens on, if you wear themPHENXNumPt^Patient

Frequently asked questions

Code details

Code64859-2
SystemLOINC
Display nameHow would you rate your eyesight now, with glasses or contact lens on, if you wear them [PhenX]
DescriptionHow would you rate your eyesight now, with glasses or contact lens on, if you wear them
Short nameRate eyesight now PhenX
ComponentHow would you rate your eyesight now, with glasses or contact lens on, if you wear them
PropertyNum
TimingPt
System (specimen)^Patient
ScaleOrd
MethodPhenX
ClassPHENX
StatusTRIAL

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.36
Last changed2.65

Part names

How would you rate your eyesight now, with glasses or contact lens on, if you wear themNumPt^PatientOrdPhenXNumber (count)Point 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.