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Ophthalmoscopy - Types, Uses, and Procedure

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Ophthalmoscopy is a test done to visualize the parts of the eye. Read this article to know more.

Medically reviewed byDr. Shachi Dwivedi
Published At May 9, 2023
Reviewed AtJune 2, 2023

What Is Ophthalmoscopy?

Ophthalmoscopy is a test performed by an ophthalmologist (eye specialist). It may also be known as fundoscopy. The ophthalmoscopy is performed by an instrument known as an ophthalmoscope. Ophthalmoscopy is performed when the doctor wants to visualize the parts at the back of the eye, such as the fundus, the retina, the optic disc, and its blood vessels. This test forms part of a routine eye examination. This test shows the health of the retina and the fundus. The components of the posterior eye can be viewed through the pupil. The pupils can be dilated using specific eye drops to view the fundus and retina. However, the eyes' parts can be viewed without dilating the pupil.

What Are the Types of Ophthalmoscopy?

The two types of ophthalmoscopy are:

  1. Direct Ophthalmoscopy: Direct ophthalmoscope is an instrument about the size of a small torchlight with various lenses that can amplify up to around 15 times. This type of ophthalmoscope is generally utilized during a routine assessment of the eyes. The container ophthalmoscope has a bigger lens with a variable centering, considering a more extensive field of view.

  2. Indirect Ophthalmoscopy: Indirect ophthalmoscopy is a light joined to a headband and a small handpiece lens. It gives a more extensive perspective to the eye. Moreover, it permits a superior perspective on the fundus of the eye, regardless of whether cataracts blur the lens. This device can be monocular as well as binocular. This device is mainly used to view the periphery of the retina.

When Is Ophthalmoscopy Used?

Ophthalmoscopy can be used for the basic examination of the eye. It can also be used to check for eye diseases. Ophthalmoscopy can be used to check for:

  1. A Retinal Tear: A condition where the retina detaches from the vitreous media.

  2. Optic Nerve Abnormalities: This device is used to visualize various abnormalities of the optic nerve.

  3. Optic Disc Abnormalities: An ophthalmoscope helps to view various abnormalities of the optic disc such as optic disc drusen.

  4. Glaucoma: It is a condition that affects the optic nerve.

  5. Infections: An ophthalmoscope is used to visualize the impact of any infection of the eye.

  6. Wet Macular Degeneration: It is a degenerative condition of the eye that causes blurring of vision.

  7. Hypertension: An ophthalmoscope is used to check for the complications of hypertension in the eye.

  8. Diabetes: This device is used to check for diabetic-related complications of the eye.

What Happens Before the Ophthalmoscopy Procedure?

Before starting an ophthalmoscopy procedure, the doctor may require dilating the eyes. For this, medicated eye drops may be used to dilate the eyes. This may make the pupils expand for some time enabling them to view the components of the eye. These eye drops can make the vision foggy and delicate to light for a couple of hours. The person undergoing this test ought to carry shades to protect one's eyes from bright light as long as the pupils are dilated. Furthermore, it is advisable to avoid driving. It is advisable to avoid heavy work after the procedure as the vision may be unclear. The doctor should be informed prior in case of any allergy to any medication. In case of a family history or patient history of glaucoma, the doctor may use alternative medication that does not increase the intraocular pressure.

How Is Ophthalmoscopy Performed?

After dilating the pupils, the doctor may begin the procedure. The doctor will view the back of the eyes. The doctor may make use of three types of procedures which include:

1. Direct Examination of the Eyes:

The doctor will have the patient seated on the examination chair. After making the patient comfortable, he will use a direct ophthalmoscope to view the eye. He may change the lens to have the optimum examination. The doctor will ask the patient to look in different directions to visualize the eyes properly.

2. Indirect Examination of the Eyes:

The indirect examination will be helpful in visualizing the components of the eyes in detail. Instead of sitting, the patient will be asked to lie down during the indirect examination. The doctor will make use of the light attached to his forehead. He will use handheld lenses of various degrees of magnification. The lenses will help view the components of the eye in detail. The doctor will then reflect the light into the eyes with the help of the lens and view the components in detail. The doctor will ask the patient to look in different directions to visualize the eyes properly. The doctor may also apply pressure using a blunt probe and check for a reaction.

3. Slit-Lamp Examination of the Eyes:

The slit-lamp examination of the eyes gives a greater magnification than the indirect examination. The patient will sit in front of an instrument known as a slit-lamp. It will have a spot for one to rest the jaws and forehead. This will assist with keeping one’s head consistent during the test. After settling down, the doctor will turn on a bright light before the eyes. Then, at that point, they will utilize a magnifying lens to check out the back of the eyes. They might request the patient to glance in various ways and utilize their finger to open the eye to get a superior view. They may likewise apply mild pressure to the eyes using a blunt probe.

What Are the Risks After Ophthalmoscopy?

Ophthalmoscopy is here and there awkward, yet it ought to be easy. One might see images after the light has been switched off. Those after images ought to disappear after some time. The person may experience blurry vision for a few hours after dilation. Hence it is better to avoid hard work and driving. This process as such does not cause any risk but the eyedrops that may be used to dilate the eyes may cause some side effects. These side effects may include dry mouth and narrow-angle glaucoma.

Conclusion

Ophthalmoscopy is a test performed by an ophthalmologist (eye specialist). It is a routine test performed by the eye doctor. It is of two types, direct and indirect. This test helps in diagnosing conditions of the eye such as glaucoma, and macular degeneration. Periodic eye checkups with ophthalmoscopy aid in diagnosing many eye conditions and also aids in preventing many conditions.

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Frequently Asked Questions

Using an ophthalmoscope, the medical professional shines a light beam through the pupil to perform this examination. The ophthalmoscope resembles a flashlight in size. Thanks to its light and several tiny optics, the provider can see the back of the eyeball.

Optometrists and ophthalmologists typically perform ophthalmoscopy as part of a standard physical examination or comprehensive eye examination. It identifies and assesses the signs of some retinal vascular disorders and eye conditions like glaucoma.

The retina is the only part of the central nervous system visible from the outside. Similarly, the fundus is the only area in which vasculature is visible. Since many of the cases faced in internal medicine have vascular roots, looking at the fundus is an excellent method to understand the patient's general vascular health. However, a fundoscopic examination can reveal pathological processes that would otherwise go undetected. There are several examples of this, such as diagnosing endocarditis, widespread candidemia, CMV in an HIV-positive patient, and the ability to stage hypertension and diabetes.

During an ophthalmoscopy, any of the following circumstances may result in abnormal results:


- Retinal inflammation is caused by a virus (CMV retinitis).


- Diabetes.


- Glaucoma.


- Elevated blood pressure.


- Loss of center, crisp vision brought on by macular degeneration associated with aging.


- Skin cancer in the eyes.


- Issues with the optic nerve.

- From 18 to 39: Whenever possible, every two years at the very least, or as advised.


- From 40 to 64: Every two years, at least, or as advised.


- Ages 65 and up: Yearly minimum or as advised.

It is employed in identifying and examining signs of retinal detachment and eye conditions, including glaucoma. If one shows any indications of high blood pressure, diabetes, or other conditions affecting the blood vessels, an ophthalmoscopy may also be conducted.

The iris opens and closes the pupil to allow more or less light into the eye. Pupils must be dilated (widened) so the eye doctor can examine the inside of the eyes. Pupils will widen using dilating eye drops, preventing them from contracting when the doctor shines a light on the eyes.

With a lens held near the eye, the healthcare expert examines the back of the eye. A small, blunt probe can be used to apply pressure to the eye. The patient will be required to gaze in different directions. Typically, this test is performed to check for retinal detachments.

In cases of mydriasis, ophthalmoscopy is advised for youngsters who have accepted routine ophthalmological examinations. The preferred tool is an indirect binocular ophthalmoscope because of its ease of use, quickness, and ability to look at the peripheral retina.

Meanwhile, indirect ophthalmoscopy yields an inverted, reversed image magnified two to five times, while direct ophthalmoscopy delivers an upright, unreversed image of around fifteen times magnification.

Glaucoma Evaluation: Diagnosing and treating glaucoma depends on examining the optic nerve head during an ophthalmoscopy. Changes in the optic nerve's physical appearance, such as cupping or neuroretinal rim thinning, might indicate higher intraocular pressure and possible optic nerve damage.

This enables the doctor to examine the inside of the eye to look for indications of AMD, like drusen, which are white, yellowish patches under the retina. While a few small spots are often present in the macula as a natural part of aging, AMD (Advanced Micro Devices) is linked to the appearance of many large spots.

To check for symptoms of (Advanced Micro Devices) AMD, such as drusen, which appears as yellowish-white patches beneath the retina, enables the doctor to view the inside of the eye. Multiple large drusen are linked to (Advanced Micro Devices), even though some minor drusen are often present in the macula as a normal part of aging.

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Dr. Shachi Dwivedi from iCliniq
Dr. Shachi Dwivedi

Ophthalmology (Eye Care)

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