Advanced Eye Hospital
Advanced Eye Hospital
Automated Perimetry is an extremely sophisticated computerized procedure meant to test your field of vision. Since it is completely automated & computerized, the results are precise and accurate.
Why do we need to perform this test?
It is performed to test the field of vision in the following cases :
Glaucoma suspect/ Ocular hypertension to rule out presence of field defects. Glaucoma is an eye disorder damaging the optic nerve due to increase in the intraocular pressure. It is characterized by irreversible, progressive field loss.
Established glaucoma to look for progression of field defects.
Many neurological (brain) disorders.
Drug-induced / traumatic optic neuropathies & / or maculopathies.
This test can have an impact on further treatment of the above disorders. Hence, it is an extremely important diagnostic tool.
How do we perform test?
Automated Perimetry is an outpatient procedure taking 30-45 minutes. You will be made to sit in front of a computerized machine in a dimly lit room. Each eye will be tested separately. Glasses of your power will be inserted in the machine if required to give your clear vision. You will be asked to focus on a central light. A switch will be placed in your hand. After the initial settings, when the test begins, lights of varying intensity will be shone all around the machine in a random fashion. You will be asked to press the switch once immediately upon seeing the light. The switch should not be kept pressed for a long time.
Remember Please press the switch only if you see the light from the sides, but do not turn your eyes to look at them.
Some of the lights shown might be too dim for you to appreciate. But you need not worry about them. Visual field defects in glaucoma.
A technician will be guiding you through the procedure. In case of any watering of eyes or any other problem during the procedure you may either pause the test by keeping the switch pressed or tell the technician about it.
Throughout the procedure, you will be required to remain alert and attentive to the light stimuli. Excessive movement of the eyes and the head might cause significant errors in the report.
You need not come fasting for the test.
How often do we need to do the test?
Depending upon the patient’s eye condition, we may need to repeat the test every 6 months to 1 yr. This is to detect the progression of field defects and alter the treatment accordingly.
What is FFA?
Fluorescein Angiography is a dynamic study of the retino-choroidal status following administration of the eye, sodium fluorescein. This investigation forms an important armamentarium in the diagnosis & management of innumerable retinal disorders.
Frequently Asked Questions
Optical Coherence Tomography(OCT)
Quick, safe and informative this new retina scanner is a glimpse into the future patient care.
zies cirrus 5000 OCT machine IOL Master 700
Mrs. Bapat, your retina biopsy is complete. After examining a slice of your inner eye under a high-powered microscope, we are able to determine your vision problem and we never even touched your eye! Sounds space-aged? Not any more! Breakthroughs in ophthalmic imaging are making the retina’s inner workings transparent to a degree unimaginable even a few years ago. It’s called Optical Coherence Tomography, OCT for short. OCT is a non-invasive technology used for imaging the retina, the multi-layered sensory tissue lining the back of the eye. OCT, the first instrument used to see cross-sectional images of retina, is revolutionizing the early detection and treatment of eye conditions such as macular abnormalities & optic nerve damage.
How many ophthalmic imaging tests can claim the following?
Fast, it can provide quick, reproducible, high definition images.
Reliable and sensitive up to 5 microns (1 micron is a thousandth of a mm)
Virtually no set-up time, such as obtaining informed consent, installing film (old days), pre-treatment with antibiotics, etc.
Cirrus High Definition OCT
Cirrus High definition OCT is more advanced than its older model the stratus OCT in the following ways:
Faster-100 times more Ascans per second
More detailed-65 times higher resolution
More accurate-because of reduced artefacts
3-D imaging is possible
How does OCT work?
Rays of light provide 2 and 3-dimensional imaging of tissues at histological level.
The OCT machine has 3 modules:
OCT macular scan report literally is like an Optical Biopsy of the 10 Retinal Layersng
OCT Macula :
Examines the retina and its sub-layers for structural integrity
Sub retinal fluid
Clinical indications for macular/retinal OCT are :
Diagnosis of many retinal conditions like: Diabetic retinopathy esp maculopathy when changes are not yet evident on fundoscopy or on fluoroscein angiography.
Age related macular degeneration (ARMD)
Post cataract surgery Cystoid macular edema (CME)
Central serous retinopathy (CSR)
Pigment epithelial on neurosensory detachments at the macula
To monitor progression
To aid in treatment planning
To monitor response to therapy
OCT Optic disc for early diagnosis of glaucoma
Helps to measure the actual peripapillary retinal nerve fibre layer (RNFL) thickness. Studies have shown that the earliest signs of glaucoma are the thinning of the RNFL layer even before optic disc cupping is seen.
Hence, Extremely useful to detect glaucoma in its earlier stages even before Perimetry can detect field defects.
Useful in moniting glaucoma suspects or high risk patients for earliest signs of glaucoma progression.
OCT for anterior segment for examining cornea & anterior chamber angle structures