PICA

Description

Returns the post-incision corneal astigmatism (PICA) for an eye with given preoperative corneal astigmatism and an incision induced astigmatic change (keratometric SIA) using vector analysis.

Background
The corneal astigmatism changes as a consequence of the corneal main incision needed for the cataract or refractive lens operation. The change is affecting the power and axis of the astigmatism. The corneal astigmatism after the incision is called the post-incision corneal astigmatism (PICA). PICA consists of a magnitude and an axis. The power and axis of a toric intraocular lens have to match PICA, and not preoperative corneal astigmatism, to completely reduce the overall (refractive) astigmatism.

URL

POST https://www.zubisoft.com/api/pica

Permission

Standard authentication with public key, hashed private key and user key is required.

Parameters

Field Description
corneal_astigmatism An array which includes a cylinder and axis (valid range).
Usually, the values are taken from keratometry, for example for plus cylinders: cyl=K2-K1 and ax=steeper axis of K2.

  • cyl (-8D to 8D)
  • ax (0 to 180)
induced_astigmatism An array which includes a cylinder and axis (valid range).
The values are defined by the corneal incision, for example: cyl=SIA (as minus value !!) and ax=axis of the main incision.

  • cyl (-8D to 8D)
  • ax (0 to 180)
 

{"corneal_astigmatism": {
        "cyl": 2.22,
        "ax": 9
    },
"induced_astigmatism": {
        "cyl": -0.5,
        "ax": 80
    }
}


        

curl --location --request POST 'https://www.zubisoft.com/api/pica' \
--header 'Content-Type: application/json' \
--header 'X-Public-Key: yourPublicKey' \
--header 'X-Private-Key: hashOfYourPrivateKey' \
--header 'X-User-Key: yourUserKey' \
--data-raw '{"corneal_astigmatism": {
        "cyl": 2.22,
        "ax": 9
    },
"induced_astigmatism": {
        "cyl": -0.5,
        "ax": 80
    }
}'

Response

The response includes the following values:

Name Format [Unit] Example Comment
cyl Float [diopter] 2.63 Magnitude of PICA (plus cylinders): match cylinder power of toric IOL
ax Integer [degree] 6 Axis of PICA (plus cylinder): alignment of toric IOL 

{
    "cyl": 2.63,
    "ax": 6
}