iDoctor · Technology
Topcon KR-800 · Pretesting
A starting point
for your eye exam.
Autorefraction and keratometry provide useful measurements before your doctor-led assessment. Our Topcon KR-800 measures refractive power and the curvature of the front of your eye.
Same- and next-day appointments available.
Different measurements, different roles
Starting with information.
The KR-800 combines two types of measurement in one pretesting instrument. Your doctor considers the findings alongside your history and the rest of your examination.
Autorefraction
An automated estimate of your eye’s refractive power provides a starting point for prescription assessment. Your own responses during refraction remain important.
Keratometry
Measurements describe the curvature of the cornea, the clear front surface of the eye. These are considered in the context of your prescription and eye care.
During pretesting
Look ahead.
We guide the measurement.
Our team explains where to sit and look, then positions the instrument for the reading. Let us know if you have difficulty getting comfortable or maintaining your position.
Get positioned
Our staff guide your head position and explain where to look.
Take the measurements
The KR-800 obtains automated refractive and corneal-curvature measurements during pretesting.
Continue your examination
Dr. Sayed considers the measurements and your vision concerns. Digital refraction lets you compare lens choices with her.
A few helpful answers
Putting the results in context.
Does this replace refraction with the doctor?
No. Autorefraction provides an estimate. During refraction, your doctor considers your responses to different lens choices and the rest of your examination.
Is keratometry the same as corneal topography?
No. Keratometry measures corneal curvature. It should not be confused with a full corneal topography map.
What if I already wear glasses?
Bring them. We can use a lensometer to read the prescription in your current lenses, providing another useful point of comparison.
Personal care at iDoctor
Plan your visit.
Visit our office
132 E. Army Trail Rd.Glendale Heights, IL 60139Get directionsAbout the equipment: Topcon KR-800