SIA
Description
Returns the mean surgically induced astigmatism (SIA) from a data series submitted.
The induced astigmatism is usually calculated based on the change of keratometric (or topographic) astigmatism but can also be calculated from the change of (manifest) refractive astigmatism.
This resource allows the calculation of a keratometric SIA (using pre- and postoperative K-values = data_topographic) and a refractive SIA (using pre- and postoperative manifest cylinders = data_manifest).
Background
The main corneal incision causes a flattening effect along the orientation in which it is applied.
These curvature changes result in significant alterations to the magnitude and orientation of the principal meridians (astigmatic power and axis).
Pre-surgical consideration of these clinical variables will allow the surgeon to plan a more accurate correction of the pre-existing corneal astigmatism with the implantation of a toric intraocular lens.
The surgeon can attempt to correct the full post-operative astigmatism. This approach has led to the development of the wide range of commercially available toric IOL calculators.
URL
POST https://www.zubisoft.com/api/sia
Permission
Standard authentication with public key, hashed private key and user key is required.
Parameters
| Field | Description |
|---|---|
| data_manifest | An array which includes cases with the following data (valid range):
|
| data_topographic | An array which includes cases with the following data (valid range):
|
{"data_manifest": [{
"manifest_cylinder_pre": -6,
"manifest_cylinder_post": -1,
"manifest_ax_pre": 95,
"manifest_ax_post": 90
}, {
"manifest_cylinder_pre": -3,
"manifest_cylinder_post": -1,
"manifest_ax_pre": 100,
"manifest_ax_post": 90
}, {
"manifest_cylinder_pre": -3,
"manifest_cylinder_post": -1,
"manifest_ax_pre": 480,
"manifest_ax_post": 90
}],
"data_topography": [{
"k_flat_pre": 42,
"k_flat_post": 42,
"k_steep_pre": 45,
"k_steep_post": 44.5,
"k_steep_axis_pre" : 10,
"k_steep_axis_post": 15
}, {
"k_flat_pre": 44.58,
"k_flat_post": 42,
"k_steep_pre": 45,
"k_steep_post": 44.5,
"k_steep_axis_pre" : 10,
"k_steep_axis_post": 15
}]}
curl --location --request POST 'https://www.zubisoft.com/api/sia' \
--header 'Content-Type: application/json' \
--header 'X-Public-Key: yourPublicKey' \
--header 'X-User-Key: yourUserKey' \
--header 'X-Private-Key: hashOfYourPrivateKey' \
--data-raw '{"data_manifest": [{
"manifest_cylinder_pre": -6,
"manifest_cylinder_post": -1,
"manifest_ax_pre": 95,
"manifest_ax_post": 90
}, {
"manifest_cylinder_pre": -3,
"manifest_cylinder_post": -1,
"manifest_ax_pre": 100,
"manifest_ax_post": 90
}, {
"manifest_cylinder_pre": -3,
"manifest_cylinder_post": -1,
"manifest_ax_pre": 480,
"manifest_ax_post": 90
}],
"data_topography": [{
"k_flat_pre": 42,
"k_flat_post": 42,
"k_steep_pre": 45,
"k_steep_post": 44.5,
"k_steep_axis_pre" : 10,
"k_steep_axis_post": 15
}, {
"k_flat_pre": 44.58,
"k_flat_post": 42,
"k_steep_pre": 45,
"k_steep_post": 44.5,
"k_steep_axis_pre" : 10,
"k_steep_axis_post": 15
}]}'
Response
The response includes the following values:
| Name | Format [Unit] | Example | Comment |
|---|---|---|---|
| refractive_sia_mean | Float [diopter] | 0.92 | This is the mean refractive SIA |
| refractive_valid_cases | Float | 82 | Number of cases with valid data (correct range) |
| refractive_invalid_cases | Float | 3 | Number of cases with invalid data (value out of range) |
| keratometric_sia_mean | Float [diopter] | 0.59 | This is the mean keratometric SIA |
| keratometric_valid_cases | Float | 122 | Number of cases with valid data (correct range) |
| keratometric_invalid_cases | Float | 0 | Number of cases with invalid data (value out of range) |
{
"refractive_sia_mean": 0.92,
"refractive_valid_cases": 82,
"refractive_invalid_cases": 31,
"keratometric_sia_mean": 0.59,
"keratometric_valid_cases": 122,
"keratometric_invalid_cases": 0
}