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RETINAL EXAMINATION and DIGITAL RETINAL PHOTOGRAPHY

Yang Low Ophthalmic Opticians is the first to introduce retinal photography to Miri back in 1997, since then we have upgraded our camera from a Polaroid one used extensively at the time, to the present more advanced digital retinal camera.
At present, we are still the only private optometrist to have this service in Miri.
We pioneered, Diabetic Retinopathy Screening in Miri with our community pilot projects to established the prevalence of diabetic retinopathy in Miri.

 

What is Retinal Photography

Retinal Photography takes a high resolution digital photograph of the retina. The retina is the light sensitive inner lining of the eye. It's made of several individual layers and acts in a similar way to the film in a traditional camera. Light enters the eye, and is focused by the cornea (the front of the eye) and intra-ocular lens (the lens within the eye) on to the retina. This information is then transmitted to the brain via the optic nerve.

The photograph allows us to view all the blood vessels around the retina, the macula (the most sensitive part of the retina) and the optic nerve. In fact, this is the only non- invasive way blood vessels in our body can be viewed.

 

What does the test involve?

This test is very quick and painless. It involves sitting in front of a camera and fixating on a set target. Within a single flash a digital photograph of the retina is taken.

 

Why is it important?

Over time, there are many conditions that can directly affect our eyes and bodies. Since we can get a direct view of the blood vessels in the eye, we can identify these conditions more accurately with a picture.

Conditions that can effect our sight include:
Diabetes
High blood pressure
High cholesterol levels
Retinal holes and retinal detachment.
Glaucoma
Age-related macular degeneration

Since, the eye is the only place in the body where the internal blood vessels can be viewed directly and we are looking for any abnormalities or changes that may have occurred, we highly recommend this to be done as a routine checkup. By taking a digital image we can enlarge different sections of the retina to get a more detailed view so even the smallest changes to structures can be monitored and managed more effectively. Over time we will be able to pull forward previous images to compare any changes.
 

Why should I have retinal photography?

The benefits of the test are seen in the future rather than immediately. So we recommend this test as part of every eye health consultation.
Put simply, this simple & inexpensive test may prove to SAVE YOUR SIGHT.




Indirect Ophthalmoscopy


Ophthalmoscopy or Funduscopy is an examination of the back part of the eyeball (fundus), which includes the retina, optic disc, choroid, and blood vessels.

 

How the test is performed

There are different types of ophthalmoscopy.
Direct ophthalmoscopy
Indirect ophthalmoscopy
Slit-lamp ophthalmoscopy

Direct ophthalmoscopy: You will be seated in a darkened room. The health care provider performs this common exam by shining a beam of light through the pupil using an instrument called an ophthalmoscope. An ophthalmoscope is about the size of a flashlight. It allows the examiner to view the back of the eyeball.

Indirect ophthalmoscopy: You will either lie or sit in a semi-reclined position. The health care provider holds your eye open while shining a very bright light into the eye using an instrument worn on the head. (The instrument looks like a miner's light.) Some pressure may be applied to the eyeball using a small, blunt tool. You will be asked to look in various directions.

For information on slit-lamp ophthalmoscopy, see the article: Slit-lamp exam
Opthalmoscopy examination takes about 5 and 10 minutes.



How to prepare for the test

Indirect ophthalmoscopy and slit-lamp ophthalmoscopy are performed after eye drops are placed to widen (dilate) the pupils. Direct ophthalmoscopy can be performed with or without dilation of the pupil.
The eye drops may make it hard to focus your eyes for several hours. You should arrange to have someone else to drive after the examination. Wearing sunglasses or tinted lenses will help make your dilated pupils more comfortable.
You should tell the health care provider if you:
Are allergic to any medications
Are taking any medications
Have glaucoma or a family history of glaucoma

How the test will feel

The bright light will be uncomfortable, but the test is not painful.
You may have a brief sensation of seeing images after the light shines in your eyes. The light is brighter with indirect ophthalmoscopy, so the sensation of seeing after-images may be greater.

Pressure put on the eyeball during indirect ophthalmoscopy by may be slightly uncomfortable, but should not be painful.

If eyedrops are used, they may produce a brief stinging sensation when placed in the eyes and an unusual taste in the mouth.
 

Why the test is performed

Ophthalmoscopy is done as part of a routine physical or comprehensive eye examination.
It is used to detect and evaluate symptoms of retinal detachment or eye diseases such as glaucoma.

Ophthalmoscopy may also be done if you have signs or symptoms of high blood pressure, diabetes, or other diseases that affect the blood vessels.

 

What abnormal results mean

Abnormal results may be due to eye diseases such as a detached retina, optic nerve problems, macular degeneration, and changes caused by glaucoma. High blood pressure can also be detected.

Additional conditions under which the test may be performed:
CMV retinitis
Diabetes
Hypertensive retinopathy
Macular degeneration
Melanoma of the eye

 

What the risks are

The test itself involves no risk. The dilating eye drops may rarely produce nausea, vomiting, dryness of the mouth, flushing, dizziness, or an attack of narrow-angle glaucoma. If the latter is suspected, drops generally are not used.

 

Special considerations

Ophthalmoscopy is considered to be 90-95% accurate and can detect the early stages and effects of many serious diseases.

2009 YANG LOW OPHTHALMIC OPTICIAN. All rights reserved.