Pentacam and Perimetry Eye Tests: What They Check and What Affects the Price

A Pentacam eye test is a diagnostic scan that captures a detailed three-dimensional structural map of the cornea using Scheimpflug imaging.

A rotating camera tilts relative to the optical axis of the eye as it rotates, capturing sharp cross-sectional images from multiple angles simultaneously.

The system builds these images into a complete structural model of the anterior segment of the eye.

The result is a precise, multi-parameter assessment of the front of the eye that standard slit-lamp examination or basic corneal topography cannot replicate in the same detail or accuracy.

A Pentacam examination measures corneal topography across both the anterior and posterior surfaces, corneal thickness at every point across the full diameter, anterior chamber depth and volume, and the curvature and elevation maps that reveal structural irregularities.

These parameters together allow an ophthalmologist to identify early keratoconus, a condition where the cornea progressively thins and bulges into a cone shape, before it becomes visible on standard examination.

The Pentacam is considered the reference standard for keratoconus screening precisely because it captures posterior corneal elevation changes that appear before the anterior surface is visibly affected.

Who should get a Pentacam test:

Anyone with a family history of keratoconus should be screened proactively, since the condition has a genetic component and early detection significantly expands treatment options.

The test is mandatory before LASIK, PRK, or SMILE refractive surgery, as surgeons require accurate corneal thickness and curvature data to determine surgical suitability and plan the procedure safely.

It is also indicated for anyone with frequent unexplained prescription changes, significant astigmatism, or difficulty tolerating soft contact lenses.

A perimetry test, also called a visual field test, measures how much of the total visual field a person can perceive, including the peripheral or side vision that is not captured by standard visual acuity testing.

The patient sits facing a bowl-shaped instrument called a perimeter, fixates on a central point, and presses a button each time a flash of light is detected anywhere in the visual field around that central point.

A computer records the location and intensity of every flash presented and maps which ones the patient detected and which ones were missed, producing a visual field map that identifies any areas of reduced or absent vision.

Perimetry detects gaps or reductions in the visual field that are often completely unnoticed in daily life because the brain compensates for them. This is the reason it is the primary diagnostic and monitoring tool for glaucoma.

Glaucoma damages the optic nerve progressively, and the characteristic visual field defects it produces appear in the peripheral field long before central vision is affected.

Automated static perimetry, the most common form used in clinical practice, presents lights at defined locations across the visual field and measures the minimum intensity at which each location can be detected.

This threshold testing produces a sensitivity map that reveals the extent and pattern of any field loss.

Beyond glaucoma, perimetry detects field loss caused by retinal conditions, optic nerve disease, and lesions along the visual pathway from the optic chiasm to the occipital cortex.

Serial perimetry tests at defined intervals allow clinicians to determine whether a condition is stable or progressing.

The price of a Pentacam eye test or perimetry test is not fixed and varies based on several factors. Quoting a single number without knowing the facility, city, and clinical indication would not be accurate or useful.

Technology version affects Pentacam pricing. Basic corneal topography units cost less than advanced Pentacam systems that combine topography with axial length measurement and anterior segment imaging. The clinical information provided differs accordingly.

Facility type matters significantly. Specialist eye hospitals and established diagnostic chains typically price these tests differently from smaller clinics. Equipment maintenance, staffing, and service quality all factor into the fee structure.

City and location affect pricing across India. Tests in metro cities typically reflect higher operational costs than those in smaller cities or diagnostic networks with standardised pricing.

Combination with other tests affects the total cost. A Pentacam scan ordered as part of a comprehensive pre-surgical evaluation will often be priced differently from a standalone scan.

For an accurate and location-specific price, the most reliable approach is to check directly with the diagnostic provider or through a platform like Visit Health, where cashless pricing is available across the network.

Diagnostics: 8,500+ NABL-Accredited Labs and Vision Care Centres Employees can access eye diagnostic tests including vision assessments cashlessly through Visit Health's diagnostic network across India.

Results are tracked digitally through the app without requiring physical report collection.

Teleconsultation: Ophthalmology A Pentacam report showing posterior corneal elevation changes or a perimetry report identifying a visual field defect requires ophthalmology specialist interpretation, not a general reading of the output.

Visit Health's teleconsultation platform connects employees with ophthalmologists across 30+ specialties, same day, without a hospital visit or a separate referral.

AI-Powered Smart Reports Corneal topography maps, elevation indices, and visual field sensitivity grids are not interpretable by most patients without clinical guidance.

Visit Health's Smart Reports convert diagnostic findings into plain-language summaries explaining what each result means and what the recommended next step is.

Visit Clinic: Bengaluru (Marathahalli, Outer Ring Road). For employees in Bengaluru who need an in-person ophthalmology consultation, a referral for specialist eye care, or a pre-surgical evaluation following diagnostic findings, Visit Clinic provides on-ground appointments connected into the broader diagnostic and specialist ecosystem.

Pentacam and perimetry tests address two distinct dimensions of eye health. Pentacam examines the structural integrity of the cornea with precision that standard examination cannot match. Perimetry measures how well the visual system is functioning across the full field of vision, making it the primary tool for catching and tracking glaucoma.

What is a Pentacam eye test used for?

Creating a detailed 3D map of the cornea to detect keratoconus, assess corneal structural irregularities, and plan refractive surgeries like LASIK, PRK, and SMILE.

Is the Pentacam eye test painful?

No. It is completely non-contact and painless. The patient looks into the device while the rotating camera captures images. No eye drops or physical contact are required.

What does a perimetry test check?

The full visual field, particularly peripheral vision, to detect early glaucoma damage, optic nerve changes, retinal conditions, and visual pathway lesions.

How long does a perimetry test take?

Typically 5 to 10 minutes per eye for a standard automated static perimetry examination. Complex threshold testing may take slightly longer.

What is the difference between Pentacam and perimetry?

Pentacam examines the physical structure of the cornea. Perimetry measures the functional sensitivity of the visual field. One is a structural test, the other a functional test.

Who needs a Pentacam eye test before LASIK?

Anyone considering LASIK, PRK, or SMILE requires Pentacam evaluation beforehand. Surgeons use the corneal thickness and curvature data to confirm suitability and plan the ablation profile safely.

What factors affect the price of these tests?

Technology version, facility type, city, and whether the test is combined with other assessments. Pricing varies significantly across providers and locations.

Can employees book these tests through Visit Health?

Yes. Through Visit Health's OPD benefit, cashlessly across the diagnostic network, with digital result tracking and same-day ophthalmology teleconsultation for interpretation.

Access Pentacam and perimetry eye tests cashlessly through Visit Health's diagnostic network, with same-day ophthalmology teleconsultation for expert result interpretation.