User`s guide

16012-101 Rev. C 15
Instructions for Use (Continued)
Risk Estimate
Calculating Glaucoma
The Glaucoma Risk Calculator feature provides you with a measure of the percentage of risk that a patient might develop
glaucoma within the next 5 years. The risk calculation algorithm is based on the methods proposed by Medeiros, et al.
(*) using risk factors identified in the Ocular Hypertension Study (OHTS).
IMPORTANT: The results of the Glaucoma Risk Calculator should always be taken only as an indication of the
statistical probability of conversion from ocular hypertension to glaucoma. No conclusive determination from
these results alone should ever be drawn without an appropriate verification conducted by means of
independent diagnostic equipment.
The Calculation Screen
The calculator in the IOPac may be used in one of three ways:
1. Using the current exam measurements
2. Using patient data from the database
3. As a stand alone calculator where all patient details are manually entered
When using the calculator during an exam select Glaucoma Risk Calculator from the menu at the top of the screen. If
an average OD and OS CCT has just been calculated, these values will be shown in the Avg. OS, OD CCT data field on
the Risk Calculator page. The remaining data may be entered using the Graffiti interface at the bottom of the display.
Tap Calculate to display the percentage risk.
To calculate the risk for a patient in the database, tap on the Browse button and navigate to the patient's file. If the
selected exam has an average OD and OS CCT, these values will be averaged and shown in the Avg. OS, OD CCT data
field on the Risk Calculator page.
Again simply fill in the remaining data and tap Calculate.
To use as a stand alone calculator, select Risk Calculator on the IOPac Main Screen, and using the Graffiti interface at
the bottom of the display, fill in the data fields and tap Calculate.
(*) F.A. Madeiros, R.N. Weinreb, P.A. Sample, et al., “Validation of a Predictive Model to Estimate the Risk of Conversion from
Ocular Hypertension to Glaucoma”, Archives of Ophthalmology, Vol. 123, (Oct. 2005).