The calculator in question is the Severity Classification of Graves' Orbitopathy, also known as the Clinical Activity Score (CAS). This scoring system is used specifically in patients with Graves' disease who are experiencing eye symptoms, a condition known as Graves' orbitopathy or thyroid eye disease. 

The clinical utility of this calculator is to assess the severity and activity of Graves' orbitopathy. It helps clinicians to determine the appropriate treatment strategy, monitor disease progression, and evaluate treatment response. The score is based on clinical signs and symptoms including pain, redness, swelling, and impaired function of the eye.

There are no specific exclusion criteria for the use of the Severity Classification of Graves' Orbitopathy. However, it should be noted that this scoring system is not applicable to patients without Graves' disease or those without eye involvement. It is also less useful in patients with other eye diseases that may mimic the symptoms of Graves' orbitopathy.

Severity classification of Graves' orbitopathy

# Criteria
 ## Lid retraction
A. < 2 mm (+1)
B. >= 2 mm (+6)
## Soft tissue involvement
C. Mild (+1)
D. Moderate or severe (+6)
## Exophthalmos (above normal for race and gender)
E. < 3 mm (+1)
F. >= 3 mm (+6)
## Diplopia
G. None or transient (+1)
H. Inconstant or constant (+6)
## Corneal injury
I. Corneal exposure responsive to lubricants (+1)
J. Corneal breakdown (+25)
## Dysthyroid optic neuropathy
K. Absent (+0)
L. Present (+25)

# Conditions
- score >= 25
- score >= 6
- score <= 5
- score == 0