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DICOM PS3.3 2020a - Information Object Definitions​

Page 1151​

Attribute Name​

Tag​

Type​

Attribute Description​

 

>Keratometric Axis​

(0046,0077)​

1​ Themeridianwherethekeratometricradiusofcurvatureorpower​

 

 

 

is measured, in degrees.​

 

Flat Keratometric Axis​

(0046,0080)​

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

Sequence​

 

 

least power of curvature and longest 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.​

 

>Keratometric Axis​

(0046,0077)​

1​ Themeridianwherethekeratometricradiusofcurvatureorpower​

 

 

 

is measured, in degrees.​

 

C.8.25.11 Subjective Refraction Measurements Module​

Table C.8.25.11-1 defines the Attributes used to represent the subjective refractive measurements of a patient's eyes. Usually both​ eyes are measured, but sometimes just one.​

Table C.8.25.11-1. Subjective Refraction Measurements Module Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Subjective Refraction Right​

(0046,0097)​

1C​

A Sequence that specifies the subjective refractive​

Eye Sequence​

 

 

measurements of a patient's right eye.​

 

 

 

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

 

 

 

Required if the right eye is measured.​

 

 

 

Note​

If Subjective Refraction Right Eye Sequence​ (0046,0097) is present, Measurement Laterality​ (0024,0113), if present, will have a value of R or B as​ appropriate.​

>Include Table C.8.25.11-2 “Subjective Refraction Measurements​

Macro Attributes”​

Subjective Refraction Left​

(0046,0098)​

1C​

A Sequence that specifies the subjective refractive​

Eye Sequence​

 

 

measurements of a patient's left eye.​

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

Required if the left eye is measured.​

Note​

IfSubjectiveRefractionLeftEyeSequence(0046,0098)​ is present, Measurement Laterality (0024,0113), if​ present, will have a value of L or B as appropriate.​

>Include Table C.8.25.11-2 “Subjective Refraction Measurements​

Macro Attributes”​

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 a phoropter.​

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 a phoropter.​

- Standard -​

Page 1152​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

Attribute Description​

Intermediate Pupillary​

(0046,0063)​

3​

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

Distance​

 

 

regard is at an intermediate distance, as measured by a​

 

 

 

phoropter.​

Other Pupillary Distance​

(0046,0064)​

3​

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

 

 

 

regard is at the distance specified in the Attribute Add Other​

 

 

 

Sequence (0046,0102), as measured by a phoropter.​

Table C.8.25.11-2 describes the Attributes used for the Subjective Refraction Measurements Macro.​

Table C.8.25.11-2. Subjective Refraction Measurements Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

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”​

 

 

 

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

Add Near Sequence​

(0046,0100)​

1C​

A Sequence that specifies refractive measurements of the eye 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 near point refraction is done.​

>Add Power​

(0046,0104)​

1​

Additional power relative to the distance correction, expressed in​

 

 

 

diopters,thatallowsbestcorrectedvisualacuityatthedefinedviewing​

 

 

 

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 eye 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 intermediate point refraction is done.​

>Add Power​

(0046,0104)​

1​

Additional power relative to the distance correction, expressed in​

 

 

 

diopters,thatallowsbestcorrectedvisualacuityatthedefinedviewing​

 

 

 

distance.​

>Viewing Distance​

(0046,0106)​

3​

The distance, in cm, for testing visual acuity using the value of Add​

 

 

 

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

Add Other Sequence​

(0046,0102)​

1C​

A Sequence that specifies refractive measurements of the eye to​

 

 

 

correct for inability to focus at the below specified distance while​

 

 

 

wearing the distance prescription.​

 

 

 

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

 

 

 

Required if refraction is done at less than distance (optical infinity),​

 

 

 

but at a distance other than "near" or "intermediate".​

>Add Power​

(0046,0104)​

1​

Additional power relative to the distance correction, expressed in​

 

 

 

diopters,thatallowsbestcorrectedvisualacuityatthedefinedviewing​

 

 

 

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.​

- Standard -​

DICOM PS3.3 2020a - Information Object Definitions​

Page 1153​

C.8.25.12 Visual Acuity Measurements Module​

Table C.8.25.12-1 defines the Attributes used to represent the subjective measurements of a patient's visual acuity. Usually each eye​ is measured individually, but sometimes only one eye is measured; sometimes the visual acuity of both eyes working together is​ measured. The visual acuity may be measured uncorrected, or with various refractive corrections, such as best corrected distance,​ pinhole, habitual near, etc​

Table C.8.25.12-1. Visual Acuity Measurements Module Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Viewing Distance Type​

(0046,0125)​

1​

The viewing distance conditions under which a patient's vision​

 

 

 

was measured.​

 

 

 

Enumerated Values:​

 

 

 

DISTANCE​

 

 

 

NEAR​

 

 

 

INTERMEDIATE​

 

 

 

OTHER​

Visual Acuity Type Code​

(0046,0121)​

1​

ASequencethatspecifiestheconditionsunderwhichapatient's​

Sequence​

 

 

vision was measured.​

 

 

 

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

>Include Table 8.8-1 “Code Sequence Macro Attributes”. Defined​

 

CID 4216 “Ophthalmic Visual Acuity Type”.​

 

 

Background Color​

(0046,0092)​

1​

Thecolorofthebackgrounduponwhichoptotypesaredisplayed​

 

 

 

for measurements of visual acuity.​

 

 

 

Defined Terms:​

 

 

 

RED​

 

 

 

GREEN​

 

 

 

WHITE​

 

 

 

REDGREENSPLIT​

Optotype​

(0046,0094)​

1​

The standardized test type (standard object of regard) used in​

 

 

 

measurements of visual acuity.​

 

 

 

Defined Terms:​

 

 

 

LETTERS​

 

 

 

NUMBERS​

 

 

 

PICTURES​

 

 

 

TUMBLINGE​

 

 

 

LANDOLT C​

OptotypeDetailedDefinition​

(0046,0139)​

1C​

RequirediftheOptotype(0046,0094)AttributevalueisLETTERS​

or NUMBERS or PICTURES. Provides additional information to​ define what optotype was used.​

Note​

Letters,numbers,andpicturesarecommonlyusedbut​ poorlystandardized.ThetumblingEandLandoltCare​ well defined.​

- Standard -​

Page 1154​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

Attribute Description​

Optotype Presentation​

(0046,0095)​

1​

Specifies whether single or multiple optotypes were presented.​

 

 

 

Enumerated Values:​

 

 

 

SINGLE​

 

 

 

MULTIPLE​

Visual Acuity Right Eye​

(0046,0122)​

1C​

A Sequence that specifies the subjective measurement of a​

Sequence​

 

 

patient's visual acuity for the right eye.​

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

Required if the right eye is measured.​

Note​

If Visual Acuity Right Eye Sequence (0046,0122) is​ present, Measurement Laterality (0024,0113), if​ present, will have a value of R or B as appropriate.​

>Include Table C.8.25.12-2 “Visual Acuity Measurements Macro​

Attributes”​

Visual Acuity Left Eye​

(0046,0123)​

1C​

A Sequence that specifies the subjective measurements of a​

Sequence​

 

 

patient's visual acuity for the left eye.​

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

Required if the left eye is measured.​

Note​

If Visual Acuity Left Eye Sequence (0046,0123) is​ present, Measurement Laterality (0024,0113), if​ present, will have a value of L or B as appropriate.​

>Include Table C.8.25.12-2 “Visual Acuity Measurements Macro​

Attributes”​

Visual Acuity Both Eyes​

(0046,0124)​

3​

A Sequence that specifies a patient's subjective visual acuity​

Open Sequence​

 

 

measurements with both eyes open.​

Only a single Item is permitted in this Sequence.​

Note​

IfVisualAcuityBothEyesOpenSequence(0046,0124)​ is present, Measurement Laterality (0024,0113), if​ present, will have a value of B.​

>Include Table C.8.25.12-2 “Visual Acuity Measurements Macro​

Attributes”​

Table C.8.25.12-2 describes the Attributes for the Visual Acuity Measurements Macro.​

- Standard -​

 

 

DICOM PS3.3 2020a - Information Object Definitions​

Page 1155​

 

Table C.8.25.12-2. Visual Acuity Measurements Macro Attributes​

 

Attribute Name​

Tag​

Type​

Attribute Description​

 

Decimal Visual​

(0046,0137)​

1​ A patient's visual acuity specified in decimal. The value is derived from two values in a​

Acuity​

 

fraction where the numerator of the fraction is the nominal distance to the chart that the​

 

 

patient is reading. The denominator represents the line of smallest optotypes of which the​

 

 

patient can see more than half.​

 

 

 

 

Note​

 

 

 

 

1.​Typical examples: reference standard is 1, severe vision loss is 0.1​

 

 

 

2.​See Annex RR “Ophthalmic Refractive Reports Use Cases (Informative)” in​

 

 

 

PS3.17forguidanceinconvertingDecimalVisualAcuitytoothercustomarily​

 

 

 

used display notation such as 20/20 in the US and 6/6 in Britain.​

 

Visual Acuity​

(0046,0135)​

3​ The first value is a positive or negative integer numeric value such as +1, +2, +3, 0, -1,​

Modifiers​

 

-2, or -3 used to indicate that the patient missed letters on the line referenced, or saw​

 

 

additional letters on the next smaller line.​

 

The second value is a positive or negative integer numeric value such as +1, +2, +3, 0,​ -1, -2, or -3, which in combination with the first value indicates that the patient both saw​ additional letters on the next smaller line and missed letters on the line referenced.​

Note​

1.​When the modifier values are zero, the values are not typically displayed to​ the user.​

2.​See Annex RR “Ophthalmic Refractive Reports Use Cases (Informative)” in​ PS3.17 for guidance regarding significance of modifiers.​

C.8.25.13 Ophthalmic Axial Measurements Series Module​

Table C.8.25.13-1 specifies the Attributes that identify and describe general information about the Ophthalmic Axial Measurements​ Series.​

Table C.8.25.13-1. Ophthalmic Axial Measurements Series Module Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Modality​

(0008,0060)​

1​

Type of equipment that originally acquired the data used to​

 

 

 

create the measurements in this Series.​

 

 

 

Enumerated Values:​

 

 

 

OAM​

 

 

 

See Section C.7.3.1.1.1 for further explanation.​

Referenced Performed​

(0008,1111)​

1C​

Uniquely identifies the Performed Procedure Step SOP​

Procedure Step Sequence​

 

 

Instance to which the Series is related.​

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

Required if a Performed Procedure Step SOP Class was​ involved in the creation of this Series.​

>Include Table 10-11 “SOP Instance Reference Macro Attributes”​

- Standard -​

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