OCT can help an ophthalmologist diagnose a number of medical conditions including problems with the macula, AMD, glaucoma, and different types of retinopathy.

OCT can also help medical professionals diagnose optic nerve disorders. This is because an ophthalmologist can use OCT to spot changes to the fibers of the optic nerve.

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They must then remain still and follow the instructions of the person carrying out the procedure. These instructions will direct the person to look in certain directions throughout the scan.

Central serous retinopathy is a condition that occurs when fluid builds up under the retina. Medical professionals may also refer to this condition as central serous chorioretinopathy.

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In its early stages, diabetic retinopathy usually does not cause symptoms. Some people may notice changes in their vision, such as problems seeing things that are far away.

Can someone explain how an IR filter is able to "absorb" IR light? I tried looking for specific explanations, but no luck. Just that they have special "technology" that absorbs it. Is this just a fancy word for a different way of reflecting away IR? Where it's not simply cutting it like a Schneider TruCut, but perhaps using micro particles in the filter that simply scatter the IR light?

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The OCT device then uses these measurements to create images of a person’s retina that are cross-sectional and three-dimensional.

A medical professional can use OCT to help diagnose AMD. It can be suitable for helping diagnose both early and advanced-stage AMD.

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The macula is a small area in the center of the retina. It plays a role in helping people clearly see the details of objects.

OCT can help an ophthalmologist see the different layers of the retina. This helps them map and measure the thickness of these layers.

is there a difference between a hot mirror and a IR filter? if so when would i use a IR and a hot mirror ? is it not both to protect the chip from infrared light ?

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If a person has received dilating eye drops during OCT, their eye may be sensitive to light for several hours after the procedure.

An ophthalmologist may use OCT to help confirm a diagnosis if a person is displaying symptoms of certain eye conditions. Below are the symptoms that may lead an ophthalmologist to use OCT.

Optical coherence tomography (OCT) is a form of noninvasive imaging test that creates high-resolution, cross-sectional images of the inside of a person’s eye.

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By allowing an ophthalmologist to do all the above, OCT can help them diagnose certain eye disorders and guide specific treatments.

Read on to learn more about how OCT works. This article also explains the conditions that OCT can help with and what happens during the procedure.

The difference would be that an IR filter absorbs the IR, while the hot mirror reflects it away, and passes the visible light. For camera filters, it doesn't make a difference. It matters where you have so much light that the heat of the unwanted IR is significant, like in digital projectors. You need to not burn up the chips.

PVD can cause a person to develop vitreous traction. This is a condition that occurs when part of the vitreous remains stuck to the macula during PVD. This part of the vitreous then pulls on the macula, causing symptoms of vitreous traction.

Glaucoma is a group of eye diseases that damage the optic nerve. Glaucoma can lead to a person experiencing vision loss and blindness.

Researchers say the drug aflibercept performed better in a clinical trial than bevacizumab in helping wean people off treatments for wet age-related…

So it just uses the same principle as with any other element in the world that absorbs light and reflects, which makes it the color see. Hence the reason for white balancing when an IR filter is down (because of the green cast), whereas with a Hot Mirror it's not AS necessary it seems.

In some cases, an ophthalmologist may administer dilating eye drops before the procedure. This is to help widen the pupil to make imaging easier.

During OCT, an ophthalmologist uses a beam of light to scan an area of a person’s eye. The OCT device then measures the light that the structures within the eye have reflected back.

Diabetic retinopathy is a complication of diabetes that causes damage to the blood vessels in the retina. Learn about its causes, symptoms, and…

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as far as i know there are combined IR ND filters but only straight hot mirrors - any reason for why there is no ND hot mirror ?

During the scan, a person may focus on a target within the scanner. They may also see a red line appear during the scan.

During a CT scan, a medical professional aims the X-rays at a part of the person’s body and quickly rotates them around the body. The CT scanner processes the signals that these X-rays produce. The CT scanner then creates cross-sectional images.

Absorbtion works in IR just like in visible light. A green filter absorbs the red and blue wavelengths, and passes the green. Dyes are big complicated molecules, and some of the bonds in those molecules capture certain wavelengths, and turn the energy into motion on the molecular level, which is heat. Of course it's only a significant amount of heat if you have a huge amount of light, like in digital projectors. For camera filters, it's too little to matter. But the gels that we use on lights do fade and/or burn after a while.

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Vitreous is the substance that fills the middle of the eye. Posterior vitreous detachment (PVD) occurs when the vitreous pulls away from the retina.

Having IR/ND combos has had its problems on a couple shoots I've been on. If you want to stack IR/ND's, there can be reflection issues between the filters, so it's best to just have an IR out in front, then a couple stages behind it for regular ND filters. Besides, with the newer MX and Alexa chips, IR contamination really isn't a huge issue until you go over 1.2 ND or so, as I've been told by DIT folks. So having the lighter grades of ND equipped with an IR overlay is overkill at this point.

Optical coherence tomography (OCT) is a type of noninvasive imaging test. Ophthalmologists use OCT to create high-resolution, cross-sectional images of the inside of a person’s eye.

Without treatment, diabetic retinopathy can lead to blindness. OCT can help a medical professional diagnose diabetic retinopathy.

A person may not experience any symptoms if they have early stage glaucoma. Over time, a person may slowly experience vision loss.

Prolonged high blood sugar levels can damage the retina. This occurs when diabetes damages the blood vessels that supply the retina with blood.

Basically the same thing, and they serve the same purpose, I think it just depends on whether a specific brand chooses to call theirs an IR or Hot Mirror. Different brands have different characteristics in regards to how much IR they remove, so it's worth testing between say Tiffen or Schneider, to name a couple.

The one sorta goofy thing is that what we call an IR filter absorbs IR and passes the visible light, while what we call a green filter passes the green and absorbs the rest. So, the names are the other way around....

OCT is not the same as a computed tomography (CT) scan. OCT uses light rays to create images, and CT scans use X-ray beams.

Measuring the thickness of the different layers of a person’s retina can help an ophthalmologist diagnose a number of medical conditions, such as age-related macular degeneration (AMD) and glaucoma.