How do you do a gonio?

How Is It Done? Gonioscopy is performed with the head positioned in the slit lamp (the special microscope used to look at the eyes). After numbing the eye with drops, a special contact lens is placed directly on the eye and a beam of light is used to illuminate the angle.

How do you use a Gonio lens?


This lens is held between the thumb. And index finger the remaining fingers are used to brace the hand against the patient's cheek.

Do you dilate for a gonio exam?

For a gonioscopy exam, your eyes will be dilated with eye drops. This is done so that the ophthalmologist can fully examine the health of the optic nerve and retina. Once the pupils are dilated, you will rest your head in the chin holder of a slit-lamp microscope.

What is a gonio test?

Test Overview



Gonioscopy is an eye examination to look at the front part of your eye (anterior chamber) between the cornea and the iris. Gonioscopy is a painless examination to see whether the area where fluid drains out of your eye (called the drainage angle) is open or closed.

How do you insert a Gonio lens?

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The patient is instructed to look up and the inferior part of the lens is placed against the lower portion of the globe. The lens is tilted up and the patient is instructed to look straight ahead.

Is gonioscopy a surgery?

MIGS requires simultaneous extra- and intraocular coordination of the goniolens and instruments, respectively, making it essentially a one-handed surgery. Angle surgery is confined anterior to the iris plane with a trabecular space approximately one-third (0.7-mm width)1 of a standard keratome incision (2.2-2.4 mm).

How is IOP measured?

Your ophthalmologist will instruct you to position your head into a device called the slit lamp. Then, a small tip gently touches the surface of the eye and the eye pressure is measured. The eye pressure is measured based on the force required to gently flatten a fixed area of the cornea.

What is a Gonio lens?

Gonioscopy is using a goniolens (also known as a gonioscope) together with a slit lamp or operating microscope to view the iridocorneal angle, or the anatomical angle formed between the eye’s cornea and iris. Its use is important in diagnosing and monitoring various eye conditions associated with glaucoma.

What is gonio in ophthalmology?

Gonioscopy is an eye examination to look at the front part of your eye (anterior chamber) between the cornea and the iris. Gonioscopy is a painless examination to see whether the area where fluid drains out of your eye (called the drainage angle) is open or closed.

What are iris processes?

Iris processes are fine, lacy projections of peripheral iris tissue extending to the scleral spur or trabecular meshwork. They are a benign finding and are often seen in otherwise normal eyes.

What causes narrow angle glaucoma?

Angle-closure glaucoma, also known as narrow-angle glaucoma, is caused by blocked drainage canals in the eye, resulting in a sudden rise in intraocular pressure. This is a much more rare form of glaucoma, which develops very quickly and demands immediate medical attention.

What is an iridotomy procedure?

In laser iridotomy, a small hole is placed in the iris to create a hole for fluid to drain from the back of the eye to the front of the eye. Without this new channel through the iris, intra-ocular pressure can build rapidly causing damage to the delicate optic nerve, and permanent loss of vision.

How do you read a gonioscopy?

Interpreting Your Gonioscopy View



We recommend always starting your gonioscopy by viewing the inferior angle. This is typically the widest angle and the easiest to identify structures due to the increased pigmentation. Remember that, with indirect gonioscopy, your mirror is 180° away from the angle you are viewing.

How do you write a findings in gonioscopy?

When documenting your gonioscopy findings, draw a large X to designate the four quadrants. Record the most posterior structure youve observed in each quadrant, and record the abnormalities and amount of pigment. Also, use the van Herick system for grading angle depth.

What structures are seen in gonioscopy?

From cornea to iris, the angle structures visible on gonioscopy include Schwalbes line, trabecular meshwork (TM), scleral spur and ciliary body base (figure 1). Trabecular meshwork. The TM is the next structure seen in the angle. It is divided into anterior non-pigmented and posterior pigmented portions.

What is normal angle of eye?

Based on a previous study of anterior segment OCT, the mean anterior chamber angle of healthy normal eyes was 35.9 ± 5.7°.

How do you find the angle between iris and cornea?

a) AOD 500 (Angel Opening Distance) involves measuring a distance between a point of the cornea which is 500 μm away from the scleral spur and the opposite point of the iris. b) TIA (Trabecular-Iris Angle) involves a direct measurement of the angle.

Which type of glaucoma is considered a medical emergency?

Angle-closure glaucoma may occur suddenly (acute angle-closure glaucoma) or gradually (chronic angle-closure glaucoma). Acute angle-closure glaucoma is a medical emergency.

What is angle recession glaucoma?

Angle recession glaucoma (ARG) is a secondary open angle glaucoma that is associated with ocular trauma. Recession of the anterior chamber angle is a common slit lamp and gonioscopic finding following concussive ocular trauma.

How is angle recession treated?

Your doctor may prescribe medications, suggest laser treatment, or consider surgery. Medication: Prescription eye drops are usually the first step in treatment. For angle recession glaucoma, your doctor may prescribe a drop that causes your eye to make less fluid. That helps lower pressure.

What does your vision look like with glaucoma?

According to a study published in The American Journal of the Medical Sciences, the most common visual symptoms reported by patients with glaucoma are as follows: Needing more light. Blurry vision. Seeing glare.