FieldCurvature

Field curvature analysis result

Since R2026a

Description

Add-On Required: This feature requires the Optical Design and Simulation Library for Image Processing Toolbox add-on.

A FieldCurvature object stores a transverse field curvature analysis result that contains tangential and sagittal astigmatism values. To display a 2-D visualization of the transverse field curvature, use the show object function.

Creation

Create a FieldCurvature object when you perform field curvature analysis for an optical system using the fieldCurvature object function.

Properties

Tangential — Tangential astigmatism result

Read-only: structure

This property is read-only.

Tangential astigmatism result, represented as a structure with these fields.

Field Name	Field Value
FieldAngles	N-by-1 vector, where each element is a field angle in the range [0, F]. F is the maximum field angle, in degrees, specified using the MaxFieldAngle name-value argument of the fieldCurvature function. N is the number of evenly spaced points specified using the NumSamples name-value argument.
FieldCurvature	N-by-M numeric matrix, where each element is the tangential astigmatism value. N is the number of evenly spaced points specified using the NumSamples name-value argument, and M is the number of wavelengths specified using the Wavelengths name-value argument.

Sagittal — Sagittal astigmatism result

Read-only: structure

This property is read-only.

Sagittal astigmatism result, represented as a structure with these fields.

Field Name	Field Value
FieldAngles	N-by-1 vector, where each element is a field angle in the range [0, F]. F is the maximum field angle, in degrees, specified using the MaxFieldAngle name-value argument of the fieldCurvature function. N is the number of evenly spaced points, specified using the NumSamples name-value argument of fieldCurvature.
FieldCurvature	N-by-M numeric matrix, where each element is the sagittal astigmatism value. N is the number of evenly spaced points, specified using the NumSamples name-value argument of fieldCurvature, and M is the number of wavelengths, specified using the Wavelengths name-value argument of fieldCurvature.

Wavelengths — Wavelengths

Read-only: M-element numeric vector

This property is read-only.

Wavelengths for which the field curvature is computed, represented as an M-element numeric vector. M is the number of wavelengths specified using the Wavelengths name-value argument of the fieldCurvature function.

ReferenceWavelengthIndex — Index of reference wavelength

Read-only: positive integer

This property is read-only.

Index of the reference wavelength at which to compute the field curvature, represented as a positive integer. To set this property, use the ReferenceWavelengthIndex name-value argument of the fieldCurvature function.

MaxFieldAngle — Maximum field angle

Read-only: numeric scalar in range [0, 180]

This property is read-only.

Maximum field angle, or angle from the optical axis, at which to compute the field curvature, represented as a numeric scalar in the range [0, 180]. To compute the half field of view, or half-angle, use the halfFieldOfView function. By default, the MaxFieldAngle value is 0.9 times the value of the half-angle of the optical system opsys.

To set this property, use the MaxFieldAngle name-value argument of the fieldCurvature function.

Object Functions

show	Plot analysis result

Version History

Introduced in R2026a