What is depth of fieldformula

OCT stands for Optical Coherence Tomography. Simply put, the OCT is another non-invasive tool that “takes pictures of the back of your eye.”

Distance to subject refers to the length between the camera and the focus of the image. The closer the camera is to the subject it is focusing on, the narrower the depth of field will be. Inversely, the farther away the subject is from the camera, the wider the depth of field will be.

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Your eye care practitioner will likely recommend an OCT exam if you have an increased risk of eye disease. You may have an increased risk of eye disease if you are over the age of 50 or have: a personal history of certain eye conditions, a family history of eye disease, diabetes, hypertension, other vascular health conditions, and/or if you are taking high risk medications. Even if you don’t have a high risk of eye disease, OCT exams are still a great way to help protect your eye health. By having OCT exams regularly, it creates a baseline that your optometrist can reference. Using this baseline, your optometrist can detect the smallest changes to your eyes over time. Reno Family Eye Care performs a one time screening OCT scan on all new or existing patients presenting for their comprehensive exam at the age 40 or older at no cost. If necessary, further OCT scans can be performed, and the interval at which scans are performed are determined by your eye care practitioner.

Shallowdepth of fieldphotography

Another way to think of OCT is that it functions like an ultrasound, except it uses light* – instead of sound waves – to map the shape of the retina and optic nerve. It is safe, non-invasive, and not destructive to tissue. A camera-like device directs waves of light which bounce back and form an accurate 3-D picture of your eye (your retina). As well as the 3D scan, the OCT takes a photograph of the eye in high resolution. This allows us to pinpoint any area of concern to review in-depth.

Reno Family Eye Care performs a one time screening OCT scan on all new or existing patients presenting for their comprehensive exam at the age 40 and older at no cost. Further OCT scans are then used to monitor medical conditions like glaucoma, macular degeneration, diabetic retinopathy if warranted.

In this image a medium depth of field allows the viewer to focus on multiple subjects without creating confusion for your eyes Photo by Sebastian J. Sciotti Jr. In this image a medium depth of field allows the viewer to focus on multiple subjects without creating confusion for your eyes Download Image  Share Image: X Facebook Email Photo by: Sebastian J. Sciotti Jr. VIRIN: 170525-D-SS007-019C

We are closed the first Friday of every month until 9:30 AM for staff training. We will be closed November 28-29th, December 24th through Dec 26th at noon, and January 1 2025.

There aren’t any risks or side effects associated with optical coherence tomography scans. However, because this type of test relies on light, OCT isn’t effective if you have thick cataracts or heavy bleeding in the back of your eye.

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OCT is a great tool in diagnosing different eye diseases like: glaucoma, macular degeneration, diabetic retinopathy, retina tears, retinal detachments, central serous retinopathy, retinal/macular cysts, macular hole, macular pucker, and macular edema. In some cases OCT can help your eye care practitioner diagnose eye disease early, which allows for more effective treatment. Because the OCT images provide such a detailed view of your retina, they can detect even the smallest indications of eye disease. In addition to early disease diagnosis, OCT can also help with monitoring the progression of eye disease, diagnosing eye disease in children, which can other be difficult, and diagnosing other diseases like hypertension, multiple sclerosis, and other vascular diseases,

The following graphic illustrates how changing these factors: aperture, focal length and the distance from the subject affect the depth of field.

The aperture is the opening created by a set of overlapping metal blades, known as the diaphragm, inside a photographic lens. This opening controls the amount of light coming through the lens. The wider the aperture, the less depth of field you capture. The smaller the aperture, the deeper the depth of field.

What isshallowdepth of field

Depth of field (DoF) is the area between the nearest and farthest points from the camera that are acceptably sharp in an image. A deep DoF means all or most of your photo will be in focus, including the foreground, subject and background. Use a deep DoF in group photos, landscape shots and when elements in the background or foreground add to the message the photo is attempting to communicate. A shallow DoF means more narrow range will be acceptably sharp in the image. Shallow DoF is good to use when you want to isolate your subject from their surroundings, such as in a portrait or when elements in the background or foreground may be distracting.

In this image a deep depth of field allows the viewer to take in many subjects, including an artillery shell mid-flight. Photo by Staff Sgt. Steven Schneider In this image a deep depth of field allows the viewer to take in many subjects, including an artillery shell mid-flight. Download Image  Share Image: X Facebook Email Photo by: Staff Sgt. Steven Schneider VIRIN: 170918-O-N0132-7230C

You can affect the depth of field by changing the following factors: aperture, the focal length and the distance from the subject.

The focal length of the lens determines the image magnification. The wider the lens, the shorter the focal length. This allows you to capture a wider depth of field. The longer or more zoomed in the camera lens, the less depth of field you capture.

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You’ll sit down and rest your chin on a support attached to the machine. The OCT equipment will scan one eye at a time. You’ll focus your eyes on a green target within the machine. You may see a red line while you’re having the scan. The test will take minutes.

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In this image you can see how a shallow depth of field keeps the focus on the action. Photo by Samuel King In this image you can see how a shallow depth of field keeps the focus on the action. Download Image  Share Image: X Facebook Email Photo by: Samuel King VIRIN: 170908-F-OC707-0517C

Optical coherence tomography uses a low-powered laser to create pictures of the layers of your retina and optic nerve. The cross-sectional images are three-dimensional and color-coded.

Infographic illustrates how changing the aperture, the focal length and the distance from the subject affect the depth of field. Download Image  Share Image: X Facebook Email Photo by: DINFOS PAVILION Team VIRIN: 200907-D-PA656-0002

Your healthcare provider will evaluate the images from the optical coherence tomography test and go over them with you. They may need time to compare older scans to the newest ones. You should have the results quickly.