See Your Cornea in 3D: What a Pentacam Scan Really Shows
A Pentacam test builds a detailed 3D map of your cornea in under two seconds - measuring its shape, thickness, and curvature with a level of precision a regular eye exam can't match. At Save Sight Centre, this scan is central to screening for keratoconus, confirming LASIK candidacy, and assessing glaucoma risk.
Illustrative corneal curvature map - colours represent steepness, from flatter (blue) to steeper (orange/red) zones.
What Is a Pentacam Eye Test?
A quick, layman's explanation before your visit.
Rotating 3D Capture
A rotating camera builds a complete corneal map instead of a single flat image.
Both Surfaces, Not Just One
Measures the front and back of the cornea - most basic tools only capture the front.
Fast and Non-Contact
The scan itself takes under two seconds and never touches your eye.
What Does a Pentacam Scan Measure?
A single Pentacam scan captures several key measurements of your eye's front structures:
Corneal Curvature
The steepness and shape of your cornea's surface, useful for detecting astigmatism or keratoconus.
Corneal Thickness
Measured across the whole cornea, not just the centre, to spot localised thinning early.
Anterior & Posterior Elevation
How much the front and back corneal surfaces deviate from an ideal curve.
Anterior Chamber Depth
The space between your cornea and iris, important for glaucoma risk assessment.
What Conditions Does a Pentacam Test Help Diagnose?
Save Sight Centre uses Pentacam imaging to assess:
Keratoconus
Identifies early corneal thinning and conical bulging, and tracks progression over time.
Corneal Ectasia
Detects abnormal thinning or bulging, especially after refractive surgery.
Dry Eye Syndrome
Reveals irregularities in tear film distribution and ocular surface elevation.
Cataracts
Measures lens density and anterior chamber parameters to support surgical planning.
Glaucoma Risk
Assesses anterior chamber depth and angle to flag angle-closure glaucoma risk.
Pre & Post-LASIK Evaluation
Confirms surgical suitability beforehand and monitors for ectasia afterward.
Why Is Pentacam Important Before LASIK Surgery?
LASIK reshapes the cornea by removing tissue - so knowing its exact shape and thickness beforehand isn't optional, it's essential.
Rules Out Hidden Keratoconus
LASIK on an undiagnosed keratoconic cornea can trigger rapid, severe ectasia. Pentacam catches subtle signs a standard exam would miss.
Confirms Enough Corneal Thickness
Save Sight Centre's surgeons need precise thickness maps to ensure enough tissue remains after surgery to keep your cornea structurally stable.
Checks Both Surfaces, Not Just One
Posterior corneal elevation - invisible on basic topography - is one of the earliest warning signs of a cornea unfit for LASIK.
Personalises Your Surgical Plan
Curvature and elevation data help your surgeon plan exactly how much tissue to reshape, and where.
Assesses Post-Surgical Risk
Patients with borderline corneal profiles may be guided toward safer alternatives like PRK or SMILE instead.
Documents a Clear Baseline
Your pre-LASIK Pentacam scan becomes the reference point for any future monitoring or comparison.
In short: Pentacam is what turns "you seem like a good LASIK candidate" into "we have the structural data to confirm it." Save Sight Centre does not clear a patient for LASIK without it.
When Is a Pentacam Eye Test Done?
Save Sight Centre's specialists recommend a Pentacam test in the following situations:
You're considering LASIK, PRK, or SMILETo confirm your cornea is suitable and safe for refractive surgery.
Your glasses prescription keeps changingTo check for early corneal instability behind fluctuating vision.
Family history of keratoconusFor early screening, since keratoconus often runs in families.
High or irregular astigmatismTo get detailed topography beyond what a basic exam shows.
You've already had LASIK, PRK, or SMILEFor routine monitoring to catch any post-surgical ectasia early.
Diagnosed with keratoconus or ectasiaFor regular tracking of disease progression.
Unexplained drop in best-corrected visionTo rule out a structural corneal cause.
Contact lens intoleranceEspecially with rigid lenses, which can point to early corneal distortion.
Steps in a Pentacam Test
Save Sight Centre walks you through three phases: before, during, and after.
Preparation
- Remove soft lenses 24hrs / RGP lenses 3-5 days before
- Share your current medications and eye conditions
- Avoid eye makeup or oily products that day
Scanning
- Chin and forehead rest against the device
- Focus on a central fixation light
- Rotating camera captures 25-50 images in under 2 seconds
Results & Discussion
- Results are available instantly - no downtime
- Resume driving and all normal activities right away
- Doctor explains your corneal maps the same day
How to Interpret Pentacam Test Results
Results are shown as colour-coded maps and compared against these general reference ranges for a healthy adult eye.
| Measurement | Typical Normal Range | What a Deviation May Suggest |
|---|---|---|
| Central Corneal Thickness | 540-560 microns | Thinning may indicate early keratoconus or ectasia risk |
| Anterior Chamber Depth | 3.0-4.0 mm | Shallow depth may raise glaucoma risk |
| Corneal Curvature (Keratometry) | 42-46 diopters | Asymmetry may suggest astigmatism or keratoconus |
| Posterior Elevation | Minimal deviation | Values above +12 microns may signal early ectasia |
These are general clinical reference ranges. Save Sight Centre's doctors interpret your specific numbers alongside your symptoms and overall eye health.
Is the Pentacam Test Painful? What Are the Risks?
The Pentacam is one of the gentlest tests in eye care.
No Pain, No Contact
Nothing touches your eye - only harmless light is used to capture the images.
No Radiation
The blue light used is clinically safe and causes no tissue damage.
No Allergic Risk
Since no dye or drops are typically used, there's no risk of a drug reaction.
Rare Repeat Scans
Excessive blinking or severe dry eye may require a quick repeat scan - not a concern, just a minor delay.
What Are the Alternatives to the Pentacam Test?
Save Sight Centre may use these depending on what needs to be assessed.
Corneal Topography
Maps front corneal curvature only - useful for lens fitting and basic screening.
OCT
Better suited for retina and optic nerve, though it can also assess the front of the eye.
Wavefront Aberrometry
Measures subtle optical distortions for customised laser vision correction.
Ultrasound Pachymetry
A contact-based, single-point corneal thickness check, often used in basic glaucoma screening.
What Is the Difference Between OCT and Pentacam?
Both are advanced imaging tools at Save Sight Centre, but they focus on different parts of the eye.
OCT
Cross-sectional imaging, mainly for the retina and optic nerve - the go-to test for glaucoma and retinal disease.
Pentacam
3D corneal and anterior chamber mapping - the go-to test for keratoconus screening and LASIK planning.
How Much Does a Pentacam Eye Test Cost in Delhi?
Save Sight Centre keeps Pentacam pricing simple and transparent - no hidden charges.
| Doctor | Consultation Includes | Fee |
|---|---|---|
| Pentacam Eye Test | 3D corneal scan + specialist review | ₹2,000 |
Why Choose Save Sight Centre for Your Pentacam Test?
For over 15 years, our team in Adarsh Nagar has used Pentacam imaging to catch corneal problems - like keratoconus - years before they'd show up on a basic eye exam, and to confirm LASIK candidacy with real structural data, not just a prescription check.
We've mapped the corneas of thousands of patients across Delhi NCR, giving our doctors the experience to read subtle patterns in a Pentacam scan that a less experienced eye might miss entirely.
See Dr. Rajeev Jain's full profile →
See Dr. Shuchi Gupta's full profile →
Frequently Asked Questions About Pentacam Eye Test
Straight answers to the most common questions our patients search for - including a few that general guides often miss.
No, the Pentacam test is completely painless. It's a non-contact scan that uses only light - nothing touches your eye, and no drops or dilation are needed in most cases. You simply rest your chin on a support and look at a fixation light for a few seconds.
The actual image capture takes less than two seconds per eye at Save Sight Centre, though the full appointment, including positioning and a repeat scan if needed, usually takes about 10-15 minutes.
You'll need to remove them beforehand. Save Sight Centre recommends removing soft contact lenses at least 24 hours before your Pentacam test, and rigid gas permeable lenses 3-5 days before, so your cornea returns to its natural shape for an accurate scan.
No, dilating drops are not usually required for a standard Pentacam test at Save Sight Centre, since the scan focuses on the cornea and anterior chamber rather than the retina at the back of the eye.
Yes, you can resume all normal activities, including driving, right after a Pentacam test at Save Sight Centre. Since no dilation or contact is involved, there's no blurring or downtime afterward.
A regular eye number check (refraction) only measures your glasses prescription, while a Pentacam test creates a detailed 3D map of your cornea's shape, thickness, and curvature. Save Sight Centre often uses both together, especially before LASIK or when keratoconus is suspected.
Yes, children can have a Pentacam test, particularly if there's a family history of keratoconus or unexplained changes in their glasses prescription. Save Sight Centre's team ensures the process is quick and comfortable, since it requires no contact with the eye.
Patients with confirmed keratoconus are usually advised to repeat their Pentacam test every 6-12 months at Save Sight Centre, so our doctors can track any progression and decide if corneal cross-linking is needed.
Your Pentacam results are a major factor in LASIK eligibility, but Save Sight Centre's surgeons also consider your refraction, corneal thickness margins, and overall eye health together before confirming candidacy - it's rarely based on one test alone.
A Pentacam test at Save Sight Centre in Adarsh Nagar, Delhi costs ₹2,000, covering the full 3D corneal scan and a specialist review of your results the same day.
OCT produces cross-sectional images mainly of the retina and optic nerve, though it can also image the front of the eye. Pentacam is built specifically for detailed 3D corneal and anterior chamber mapping. Save Sight Centre uses Pentacam for corneal diagnostics like keratoconus and LASIK planning, and OCT for retina and glaucoma-related assessments.
Continue Reading
Get a Precise 3D Map of Your Cornea
Book your Pentacam test at Save Sight Centre - quick, painless, and explained by our specialists the same day.
Book Your Pentacam Scan