Home ServicesZeiss HD-OCT & Humphrey Automated Perimetry

Diagnostics SpecialityTripura's 1st NABH Hospital

Zeiss HD-OCT & Humphrey Automated Perimetry

Micron-level retinal cross-sectional OCT imaging and gold-standard Humphrey visual field testing for glaucoma and neuro-ophthalmic disease in Agartala.

Duration

15 - 30 Minutes

Anesthesia

None Required (100% Non-Contact & Non-Invasive)

Hospital Stay

Outpatient Diagnostic Suite

Recovery

Immediate (Zero Recovery Time)

Book Consultation via WhatsApp Call: +91 92336 17885

Zeiss HD-OCT & Humphrey Automated Perimetry at Ashvini Netralaya Agartala

Detailed Medical Guide

Clinical Overview & Treatment Method

Ashvini Netralaya houses Tripura’s most sophisticated ophthalmic diagnostic laboratory, featuring the Carl Zeiss Cirrus HD-OCT 5000 and the Humphrey Field Analyzer 3 (HFA3). These two world-renowned platforms form the backbone of modern clinical decision-making for glaucoma, macular degenerations, diabetic macular edema, and neuro-ophthalmic disorders.

The Zeiss Cirrus HD-OCT utilizes non-invasive spectral-domain optical coherence tomography to capture cross-sectional images of the retina, macula, and optic nerve head down to a resolution of 5 microns—providing an 'in-vivo optical biopsy' without touching the eye. Paired with Humphrey Automated Perimetry—the global gold standard for mapping the functional visual field—our diagnostic specialists correlate structural nerve fiber loss with functional vision defects years before symptoms appear.

Key Clinical Advantages at Ashvini Netralaya

Micron-level 5-micron resolution cross-sectional imaging of all 10 retinal layers

RNFL Ganglion Cell Analysis detecting microscopic glaucoma nerve damage years before visual field loss

Gold standard Humphrey SITA-Faster visual field testing with Guided Progression Analysis (GPA)

Completely non-invasive and non-contact: no needles, no drops touching the eye, and zero radiation

Instant computerized printouts comparing your eye against age-matched normative international databases

Essential for monitoring disease progression and surgical outcomes in retina and glaucoma patients

Symptoms & When to Consult an Eye Specialist

If you or your family members in Agartala or Tripura experience any of the following indications, we strongly advise scheduling an evaluation:

Diabetic or hypertensive patients needing evaluation for macular swelling or ischemia

Suspected glaucoma patients with elevated eye pressure or asymmetric optic nerve cups

Experiencing unexplained blind spots, dark patches, or missing letters while reading

Distorted, wavy vision when looking at tiled floors or door frames (metamorphopsia)

Patients taking long-term Hydroxychloroquine (HCQ) or ethambutol requiring retinal toxicity screening

Neurological conditions causing visual field loss (pituitary adenomas, stroke, optic neuritis)

Who is an Ideal Candidate for this Procedure?

All patients diagnosed with or suspected of having Glaucoma

Diabetic patients undergoing monitoring for Diabetic Macular Edema (DME)

Patients with Age-Related Macular Degeneration (AMD) or Central Serous Chorioretinopathy (CSCR)

Patients on long-term medications requiring retinal safety monitoring (Plaquenil / HCQ)

Individuals presenting with unexplained headaches, vision loss, or neurological symptoms

Options & Technology

Diagnostic Modalities: OCT vs Humphrey Perimetry

How structural imaging and functional testing work together at Ashvini Netralaya.

Option / Type	Vision Range	Night Glare	Spectacle Freedom	Ideal Candidate
Zeiss Cirrus HD-OCT Structural Gold Standard	Reveals physical tissue thickness & microscopic fluid pockets	None (uses invisible infrared light)	Diagnostic test only	Glaucoma RNFL loss, diabetic macular edema, AMD, macular hole
Humphrey Field Analyzer (HFA3) Functional Gold Standard	Maps full peripheral and central sensitivity of the visual field	None	Monitors real-world functional vision preservation	Glaucoma progression, neurological lesions, optic nerve stroke
Manual Goldmann Perimetry Traditional	Broad peripheral kinetic mapping	None	Technician-dependent	Largely replaced by automated Humphrey SITA testing

Clinical Walkthrough

Step-by-Step Procedure at Ashvini Netralaya

Conducted in our modular NABH-accredited operating theatres or diagnostic laboratories with zero-infection sterilization protocols.

Patient Comfort & Chin-Rest Alignment

2 mins

You sit comfortably in front of the Zeiss instrument with your chin resting on an ergonomic padded support.

Zeiss HD-OCT Macular & Optic Disc Cube Scan

5 mins

You look at a green fixation target inside the machine while safe infrared laser light captures 68,000 A-scans per second.

Humphrey Visual Field Testing (HFA 3)

10 mins per eye

One eye is gently patched. You hold a response button and click whenever you perceive a dim light flash inside the white testing dome.

Computerized Guided Progression Analysis (GPA)

3 mins

Software analyzes nerve thickness maps, ganglion cell complexes, and visual field sensitivity against normal populations.

Specialist Consultation & Review

10 mins

Your ophthalmologist reviews the detailed color reports with you and explains the diagnosis and treatment recommendations.

Post-Op Healing

Recovery Timeline & Visual Milestones

Immediate Post-Test

Test Completion & Normal Routine

There are zero after-effects. You can immediately return to office work, driving, or screen use.

Collect printed diagnostic report
Consult doctor with results
Resume all normal activities

6 Months to 1 Year Recall

Periodic Progression Monitoring

Repeat scans are overlaid on previous baselines via Guided Progression Analysis (GPA) to verify that treatment is working.

Attend routine follow-up scan

Pre-Procedure Preparation

•Bring your distance and reading glasses to the appointment (used during visual field testing).
•Get a good night's sleep before a visual field test so you feel alert and attentive during the test.
•Pupil dilation is generally not required for Cirrus OCT; wear your normal daily contact lenses or glasses.
•Bring all previous OCT scans or field reports from other clinics for chronological comparison.
•No fasting or medication restrictions apply.

Post-Procedure Guidelines

•There are no physical restrictions following OCT or perimetry testing.
•Store your printed color reports carefully in your medical file for future comparisons.
•Follow your ophthalmologist's clinical recommendations regarding medical or laser treatment.
•Schedule your periodic recall test as advised to ensure early detection of any disease progression.

Precision Equipment & Technological Advantage

Cirrus HD-OCT 5000

Carl Zeiss Meditec (Germany)

Captures 68,000 axial scans per second with FastTrac retinal tracking, compensating for involuntary eye movements to yield artifact-free scans.

Humphrey Field Analyzer 3 (HFA3)

Carl Zeiss Meditec (Germany)

Features patented SITA Faster testing strategies, cutting test times down to 2-3 minutes while maintaining gold-standard clinical accuracy.

“My doctor suspected glaucoma but wasn't sure. Ashvini Netralaya performed the Zeiss OCT and Humphrey field test. The doctor showed me the 3D colored nerve map on screen and clearly explained that my optic nerve was healthy. The testing was so fast and comfortable.”

Kakali Majumder, 45Bishalgarh, Tripura • Normal Glaucoma Screening with Confirmed Baseline RNFL

Frequently Asked Questions About Zeiss HD-OCT & Humphrey Automated Perimetry

Does an OCT scan involve radiation or painful eye contact?

No, absolutely not. An OCT scan uses safe, invisible near-infrared light waves similar to ultrasound, but using light instead of sound. Nothing touches your eye, and there is zero radiation involved.

Why do I need both an OCT scan and a Humphrey visual field test?

Glaucoma causes structural damage to nerve fibers (which the OCT measures down to the micron) as well as functional blind spots in your field of vision (which the Humphrey perimeter tests). Combining both gives your doctor a complete, 360-degree picture of your eye health.

How long does a Humphrey visual field test take?

With our advanced Humphrey HFA3 SITA Faster software, testing each eye typically takes only 2.5 to 4 minutes, compared to 10-15 minutes on older machines.

What should I do if I feel tired during a visual field test?

You can pause the test at any moment! Simply keep the response button pressed down continuously; the machine will pause immediately until you release the button when you feel rested.

Can an OCT scan detect diabetic retinopathy before I have symptoms?

Yes! High-definition OCT detects microscopic fluid accumulation (macular edema) and subclinical retinal swelling months before you notice any blurriness, allowing for early, vision-saving treatment.

Do my pupils have to be dilated for an OCT scan?

In most cases, the Zeiss Cirrus HD-OCT captures high-quality scans through natural, undilated pupils. If your pupils are exceptionally small or cataracts are dense, mild dilating drops may occasionally be used.

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