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Page 1146​

DICOM PS3.3 2020a - Information Object Definitions​

C.8.25.7 General Ophthalmic Refractive Measurements Module​

Table C.8.25.7-1 defines the General Ophthalmic Refractive Measurements Module Attributes.​

Table C.8.25.7-1. General Ophthalmic Refractive Measurements Module Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Instance Number​

(0020,0013)​

1​

A number that identifies these measurements.​

Content Date​

(0008,0023)​

1​

The date the measurements data creation started.​

Content Time​

(0008,0033)​

1​

The time the measurements data creation started.​

Measurement Laterality​

(0024,0113)​

3​

Laterality of refractive measurement performed.​

 

 

 

Enumerated Values:​

 

 

 

R​right​

 

 

 

L​left​

 

 

 

B​both left and right together​

 

 

 

Note​

 

 

 

1.​Laterality (0020,0060) is a Series level Attribute and​

 

 

 

mustbethesameforallMeasurementsintheSeries,​

 

 

 

hence it must be absent if multiple instances from​

 

 

 

different eyes or lenses are encoded.​

 

 

 

2.​Needs to be consistent with any other laterality​

 

 

 

information contained at the Measurement level.​

Image Comments​

(0020,4000)​

3​

User-defined comments about this SOP Instance.​

Referenced Refractive​

(0046,0145)​

2C​

A Sequence that specifies Ophthalmic Refractive Measurements​

Measurements Sequence​

 

 

SOP Instances that are relevant to the interpretation of this SOP​

Instance.​

Zero or more Items shall be included in this Sequence.​

See Section C.8.25.7.1.1 for further explanation.​

Required if Visual Acuity Type Code Sequence (0046,0121) is​ present. May be present otherwise.​

>IncludeTable10-11“SOPInstanceReferenceMacroAttributes”​

C.8.25.7.1 General Ophthalmic Refractive Measurements Module Attributes​

C.8.25.7.1.1 Referenced Refractive Measurements Sequence​

Whenever visual acuity is measured it is necessary to know the conditions under which it was measured. If the vision was measured​ with the patient's habitual correction in place, this Attribute is used to reference a lensometry measurements SOP instance for the​ current glasses. If the measurements are of the patient's best-corrected vision, this Attribute may reference the SOP instance that​ describes the correction that resulted in that vision, which may for example be the subjective refraction, or the autorefraction.​

This Attribute enables a receiver of this SOP instance to identify the results of measurements from a lensometer, autorefractor, or​ automated phoropter (subjective refraction) that are relevant to interpretation.​

C.8.25.8 Lensometry Measurements Module​

Table C.8.25.8-1 defines the Attributes used to capture the refractive measurements by a lensometer for spectacles. This is typically​ for a pair of lenses, but sometimes for just one. Sometimes a single lens is measured with an unknown laterality.​

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DICOM PS3.3 2020a - Information Object Definitions​ Page 1147​

Table C.8.25.8-1. Lensometry Measurements Module Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Lens Description​

(0046,0012)​

2​

A free text description of the lens and lens general comments.​

 

 

 

Note​

 

 

 

A common example is to identify the specific​

 

 

 

spectacles measured​

Right Lens Sequence​

(0046,0014)​

1C​

A Sequence that specifies measurements of a patient's right​

lens.​

Required if the right lens is measured.​

Only a single Item shall be included in this Sequence.​

Note​

If Right Lens Sequence (0046,0014) is present,​ Measurement Laterality (0024,0113), if present, will​ have a value of R or B as appropriate.​

>Include Table C.8.25.8-2 “Lensometry Measurements Macro​

Attributes”​

Left Lens Sequence​

(0046,0015)​

1C​

ASequencethatspecifiesmeasurementsofapatient'sleftlens.​

 

 

 

Required if the left lens is measured.​

 

 

 

Only a single Item shall be included in this Sequence.​

 

 

 

Note​

 

 

 

If Left Lens Sequence (0046,0015) is present,​

 

 

 

Measurement Laterality (0024,0113), if present, will​

 

 

 

have a value of L or B as appropriate.​

>Include Table C.8.25.8-2 “Lensometry Measurements Macro​

 

Attributes”​

 

 

 

Unspecified Laterality​

(0046,0016)​

1C​

A Sequence that specifies measurements of one lens of​

Lens Sequence​

 

 

unknown laterality.​

 

 

 

Only a single Item shall be included in this Sequence.​

 

 

 

Shall not be included if Attribute Right Lens Sequence​

 

 

 

(0046,0014) or Left Lens Sequence (0046,0015) is present.​

 

 

 

Required if a single lens of unknown laterality is measured.​

>Include Table C.8.25.8-2 “Lensometry Measurements Macro​

 

Attributes”​

 

 

 

Table C.8.25.8-2 describes the Attributes for the Lensometry Measurements Macro.​

 

Table C.8.25.8-2. Lensometry Measurements Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Sphere Power​

(0046,0146)​

1​

Refractive power of the lens that is the same in all meridians,​

 

 

 

measured at distance (optical infinity), in diopters.​

IncludeTableC.8.25.6.1-1“CylinderSequenceMacroAttributes”​

- Standard -​

Page 1148​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

Attribute Description​

Add Near Sequence​

(0046,0100)​

1C​

A Sequence that specifies refractive measurements of the lens to​

 

 

 

correct for inability to focus at near while wearing the distance​

 

 

 

prescription.​

 

 

 

Only a single Item shall be included in this Sequence.​

 

 

 

Required if Add Near is measured in the lens.​

>Add Power​

(0046,0104)​

1​

Additional power relative to the distance correction, expressed in​

 

 

 

diopters, that allows best corrected visual acuity at the defined​

 

 

 

viewing distance.​

>Viewing Distance​

(0046,0106)​

3​

The distance, in cm, for testing visual acuity corresponding to the​

 

 

 

value of Add Power (0046,0104) in this Sequence.​

Add Intermediate​

(0046,0101)​

1C​

A Sequence that specifies refractive measurements of the lens to​

Sequence​

 

 

correct for inability to focus at intermediate distance while wearing​

 

 

 

the distance prescription.​

 

 

 

Only a single Item shall be included in this Sequence.​

 

 

 

Required if Add intermediate is measured in the lens.​

>Add Power​

(0046,0104)​

1​

Additional power relative to the distance correction, expressed in​

 

 

 

diopters, that allows best corrected visual acuity at the defined​

 

 

 

viewing distance.​

>Viewing Distance​

(0046,0106)​

3​

The distance, in cm, for testing visual acuity corresponding to the​

 

 

 

value of Add Power (0046,0104) in this Sequence Item.​

Include Table C.8.25.6.2-1 “Prism Sequence Macro Attributes”​

Lens Segment Type​

(0046,0038)​

3​

The type of segment of a lens containing the "add" power, as​

 

 

 

described above​

 

 

 

Enumerated Values:​

 

 

 

PROGRESSIVE​

 

 

 

NONPROGRESSIVE​

Optical Transmittance​

(0046,0040)​

3​

The fraction of light that passes through the measured lens optical​

 

 

 

media, in percent.​

Channel Width​

(0046,0042)​

3​

In a progressive lens, the width in mm of that portion of the lens​

where there is gradual or progressive increase in "add" power.​ Note​

See Attributes, Add Near Sequence (0046,0100) and Add​

IntermediateSequence(0046,0101)fordescriptionof"add".​

C.8.25.9 Autorefraction Measurements Module​

Table C.8.25.9-1 defines the Attributes used to represent the refractive measurements by an autorefractor of a patient's eyes. Usually​ both eyes are measured, but sometimes just one.​

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DICOM PS3.3 2020a - Information Object Definitions​ Page 1149​

Table C.8.25.9-1. Autorefraction Measurements Module Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Autorefraction Right Eye​

(0046,0050)​

1C​

ASequencethatspecifiesrefractivemeasurementsofapatient's​

Sequence​

 

 

right eye.​

 

 

 

Only a single Item shall be included in this Sequence.​

 

 

 

Required if the right eye is measured.​

 

 

 

Note​

 

 

 

If Autorefraction Right Eye Sequence (0046,0050) is​

 

 

 

present, Measurement Laterality (0024,0113), if​

 

 

 

present, will have a value of R or B as appropriate.​

>Sphere Power​

(0046,0146)​

1​

Refractive power of the eye that is the same in all meridians,​

 

 

 

measured at distance (optical infinity), in diopters.​

>Include Table C.8.25.6.1-1 “Cylinder Sequence Macro Attributes”​

>Pupil Size​

(0046,0044)​

3​

The horizontal diameter measurement of the pupil, in mm.​

>Corneal Size​

(0046,0046)​

3​

The horizontal diameter measurement of the cornea, in mm.​

Autorefraction Left Eye​

(0046,0052)​

1C​

ASequencethatspecifiesrefractivemeasurementsofapatient's​

Sequence​

 

 

left eye.​

 

 

 

Only a single Item shall be included in this Sequence.​

 

 

 

Required if the left eye is measured.​

 

 

 

Note​

 

 

 

If Autorefraction Left Eye Sequence (0046,0052) is​

 

 

 

present, Measurement Laterality (0024,0113), if​

 

 

 

present, will have a value of L or B as appropriate.​

>Sphere Power​

(0046,0146)​

1​

Refractive power of the eye that is the same in all meridians,​

 

 

 

measured at distance (optical infinity), in diopters.​

>Include Table C.8.25.6.1-1 “Cylinder Sequence Macro Attributes”​

>Pupil Size​

(0046,0044)​

3​

The horizontal diameter measurement of the pupil, in mm.​

>Corneal Size​

(0046,0046)​

3​

The horizontal diameter measurement of the cornea, in mm.​

Distance Pupillary Distance​

(0046,0060)​

3​

Distance in mm between the pupils when the patient's object of​

 

 

 

regard is in the distance, as measured by an autorefractor.​

Near Pupillary Distance​

(0046,0062)​

3​

Distance in mm between the pupils when the patient's object of​

 

 

 

regard is at near, as measured by an autorefractor.​

C.8.25.10 Keratometry Measurements Module​

Table C.8.25.10-1 defines the Attributes used to represent the keratometric measurements by a keratometer of a patient's eyes.​ Usually both eyes are measured, but sometimes just one.​

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Page 1150​ DICOM PS3.3 2020a - Information Object Definitions​

Table C.8.25.10-1. Keratometry Measurements Module Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Keratometry Right Eye​

(0046,0070)​

1C​

ASequencethatspecifieskeratometricmeasurementsofapatient'sright​

Sequence​

 

 

eye, defining principal meridians wherein the steepest meridian is​

 

 

 

separated by 90 degrees from the flattest.​

 

 

 

Only a single Item shall be included in this Sequence.​

 

 

 

Required if the right eye is measured.​

 

 

 

Note​

 

 

 

1.​Consideration for steep, flat, and spherical meridians is​

 

 

 

made. For instances where spherical keratometric​

 

 

 

measurements are obtained, values specified in the steep​

 

 

 

and flat Attributes are equivalent.​

 

 

 

2.​IfKeratometryRightEyeSequence(0046,0070)ispresent,​

 

 

 

Measurement Laterality (0024,0113), if present, will have​

 

 

 

a value of R or B as appropriate.​

>Include Table C.8.25.10-2 “Keratometric Measurements​

Macro Attributes”​

 

 

 

Keratometry Left Eye​

(0046,0071)​

1C​

A Sequence that specifies keratometric measurements of a patient's left​

Sequence​

 

 

eye, defining principal meridians wherein the steepest meridian is​

 

 

 

separated by 90 degrees from the flattest.​

Only a single Item shall be included in this Sequence.​

Required if the left eye is measured.​

Note​

1.​Consideration for steep, flat, and spherical meridians is​ made. For instances where spherical keratometric​ measurements are obtained, values specified in the steep​ and flat Attributes are equivalent.​

2.​If Keratometry Left Eye Sequence (0046,0071) is present,​ Measurement Laterality (0024,0113), if present, will have​ a value of L or B as appropriate.​

>Include Table C.8.25.10-2 “Keratometric Measurements​

Macro Attributes”​

Table C.8.25.10-2 describes the Attributes for the Keratometric Measurements Macro.​

Table C.8.25.10-2. Keratometric Measurements Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Steep Keratometric Axis​

(0046,0074)​

1​ A Sequence that specifies the steepest meridian as defined by​

Sequence​

 

 

the greatest power of curvature and shortest radius of curvature.​

 

 

 

Only a single Item shall be included in this Sequence.​

>Radius of Curvature​

(0046,0075)​

1​ The radius of curvature of the principal meridians of the cornea,​

 

 

 

measured in mm.​

>Keratometric Power​

(0046,0076)​

1​ The refractive power of the cornea at the principal meridians,​

 

 

 

measured in diopters.​

- Standard -​

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