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A keratometer measures the curvature of the cornea by analyzing reflections of a target pattern. It reports steep and flat meridians that describe corneal power and astigmatism. These values guide base curve selection for contacts and aid pre-operative calculations. The test is noncontact, quick, and repeatable with steady fixation. Consistent technique helps produce reliable numbers for comparison over time.
read more about keratometer ...Hypertropia occurs when one eye turns upward compared to the other. This misalignment makes the eyes point at different targets, leading to double vision or poor depth perception. It can appear constantly or only when tired. The condition results from issues with eye muscles or nerves. Children and adults can both develop it for various reasons.
Hypertropia involves imbalance in the extraocular muscles that control vertical alignment. The superior or inferior rectus and oblique muscles differ in tone or length. Orbital anatomy and nerve pathways determine how each eye moves relative to the other. Imaging often reveals subtle asymmetry in muscle volume or insertion points.
A keratometer evaluates corneal curvature for diagnosing astigmatism and fitting contact lenses. It provides data that support clear and stable vision through proper lens selection.
Every tool, measurement, and test in eye care contributes to maintaining accurate vision and eye health. Whether used to diagnose conditions, guide prescriptions, or fine-tune lens performance, these elements help eye care professionals provide clear, reliable results and give every patient precise, comfortable vision.
A keratometer measures the curvature of the cornea by reading reflections from the corneal surface. The results describe the steep and flat meridians, which helps estimate corneal astigmatism and gives a starting point for contact lens fitting. The test is quick and non-contact, so it is commonly used in routine exams and pre-surgical checks.
Keratometry samples a small central area of the cornea, which is helpful but limited when the cornea is irregular. Corneal topography or tomography maps a much wider zone and can reveal patterns linked to conditions like keratoconus or post-surgery changes. If symptoms and keratometer numbers do not match, mapping tests often provide the missing detail.
Fittings for rigid, scleral, and even soft lenses start with keratometry values. Surgeons review readings before cataract or corneal procedures. In dry eye, fluctuating numbers can point to unstable tear film. The test also helps confirm suspected keratoconus. It is a standard part of many routine eye exams.
Ask patients to blink fully before each capture to smooth the tear film. Remove contact lenses before testing unless instructed otherwise. Reposition if mires look distorted or off-center. Take multiple readings and average when needed. Document device type to keep follow-ups comparable.
Look for clear, sharp mires without smearing or gaps. If reflections look uneven, address dryness or debris first. Keep the target centered and avoid tilting the instrument. Confirm alignment along both axes before recording values. Repeat the process to verify stability.
No, it does not touch the eye.
“Keratometry.” Cleveland Clinic. https://my.clevelandclinic.org/health/diagnostics/keratometry. Published November 11, 2024.
“Keratometer.” StatPearls. NCBI Bookshelf (NIH). https://www.ncbi.nlm.nih.gov/books/NBK585071/. Last updated June 11, 2023.
“What Is Keratometry?” New England College of Optometry (NECO). https://www.neco.edu/what-is-keratometry/. Published January 1, 2024.
“Comparison of Three Keratometry Instruments.” PubMed (National Library of Medicine, NIH). https://pubmed.ncbi.nlm.nih.gov/7473126/. Published 1995.
“The Optical Performance of Manual Keratometers.” PubMed Central (PMC). https://pmc.ncbi.nlm.nih.gov/articles/PMC1857431/. Published January 1, 2007.