Your ophthalmologist will thoroughly examine your eyes and make sure you are a candidate for LASIK. Here is what they will do:

You and your ophthalmologist will discuss your vision needs based on your lifestyle. For example, if you play sports, you may be seeking clear distance vision from surgery.

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To determine whether you are a candidate for LASIK, your ophthalmologist will examine your eyes. Here is what will be done:

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The ability to adjust your camera's sensitivity (ISO) is one of the great advantages of digital capture. Unlike with film cameras, you can change the ISO for every shot with ease, should you wish to. But when and why should you change this fundamental photographic control, which, along with aperture and shutter speed, makes up part of the exposure triangle.

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To help with presbyopia, some people have LASIK to get monovision. This means one eye is left slightly nearsighted and the other eye is adjusted for distance vision. The brain learns to adapt so that the nearsighted eye is used for close work, while the other eye sees distant objects. Monovision is not for everyone. To see if you are able to adapt to this correction, you will probably want to try monovision with contact lenses first.

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But what is ISO, exactly? Changing your ISO setting means that you can tailor the camera to various situations. Doing so will help you to end up with an image that's sharp and appropriately exposed, whatever the environment.

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ISOphotography

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In some cases, your ophthalmologist will measure the quality and the amount of tears that your eyes make. This is to check if you have dry eye, and if so, how severe it is.

For you to see clearly, light rays must travel through your cornea and lens. The cornea and lens refract the light so it lands on the retina. The retina turns light into signals that travel to your brain and become images. With refractive errors, the shape of your cornea or lens keeps light from bending properly. When light is not focused on the retina as it should be, your vision is blurry.

His first serious camera was the iconic Olympus OM10, with which he won the title of Young Photographer of the Year - long before the advent of autofocus and memory cards. Today he uses a Nikon D800, a Fujifilm X-T1, a Sony A7, and his iPhone 15 Pro Max.

ISOdynamic rangeChart

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About 9 out of 10 people (90%) who have LASIK end up with vision between 20/20 and 20/40—without glasses or contact lenses.

Also, women who are pregnant or breastfeeding should not have LASIK. This is due to vision changes that can happen during pregnancy.

This is easy in good lighting conditions as your camera doesn't need a very high ISO setting to capture the image. So, if there's plenty of light in the scene, you can use a setting such as ISO 100 or 200.

This laser eye surgery is done in an outpatient surgery center or your ophthalmologist’s office. Your eye surgeon uses a laser to reshape your cornea. Here is what to expect:

LASIK is a type of refractive surgery. This kind of surgery uses a laser to treat vision problems caused by refractive errors. You have a refractive error when your eye does not refract (bend) light properly. For you to see clearly, light rays must travel through your cornea and lens. The cornea and lens refract the light so it lands on the retina. The retina turns light into signals that travel to your brain and become images. With refractive errors, the shape of your cornea or lens keeps light from bending properly. When light is not focused on the retina as it should be, your vision is blurry. With LASIK, your ophthalmologist uses a laser to change the shape of your cornea. This laser eye surgery improves the way light rays are focused on the retina. LASIK is used to treat myopia (nearsightedness), hyperopia (farsightedness) and astigmatism. The goal of LASIK is to correct your refractive error to improve your vision. LASIK eye surgery may reduce your need for eyeglasses or contact lenses. In some cases, it may even allow you to do without them completely. Who Is a Good Candidate for LASIK Surgery? To have LASIK surgery, you need to meet certain requirements. Here are some of them: You should be 18 years or older (ideally, over 21 years old, when vision is more likely to have stopped changing). Your eye prescription should not have changed much in the last year. Your refractive error must be one that can be treated with LASIK. Your corneas need to be thick enough and healthy, and your overall eye health must be generally good. You need to have realistic expectations about what LASIK can and cannot do for you. Some people are not candidates for LASIK. They include people with: an unstable (changing) refractive error extreme levels of myopia, hyperopia or astigmatism severe dry eye corneas that are too thin corneal scars or disease keratoconus (cone-shaped cornea) advanced glaucoma a cataract affecting vision a history of having certain eye infections diabetes that is not controlled well Also, women who are pregnant or breastfeeding should not have LASIK. This is due to vision changes that can happen during pregnancy. Your ophthalmologist can talk with you about other conditions that may keep you from having LASIK. To determine whether you are a candidate for LASIK, your ophthalmologist will examine your eyes. Here is what will be done: The overall health of your eyes will be checked. Measurements of your cornea will be taken. Your refractive error will be measured. In some cases, your ophthalmologist will measure the quality and the amount of tears that your eyes make. This is to check if you have dry eye, and if so, how severe it is. What to Expect With LASIK Before the laser eye surgery You and your ophthalmologist will discuss your vision needs based on your lifestyle. For example, if you play sports, you may be seeking clear distance vision from surgery. Also, you and your ophthalmologist should discuss your expectations for LASIK. People who have LASIK to achieve perfect vision without glasses or contacts run the risk of being disappointed. This laser eye surgery allows people to do most of their everyday tasks without corrective lenses. However, you might need to wear glasses for certain activities, such as reading or driving at night. Your ophthalmologist will thoroughly examine your eyes and make sure you are a candidate for LASIK. Here is what they will do: Test your vision. This is to make sure that your vision has not changed. It also shows how high your refractive error is and whether LASIK can be used to correct your vision. Check for other eye problems. Your ophthalmologist will make sure that you do not have eye problems. This is because other problems could affect your surgery, or LASIK could make those other problems worse. For example, if you have dry eyes, they may be worse after LASIK. Measure and map the surface of your cornea. Your ophthalmologist will check the thickness of your cornea and make precise measurements of the cornea’s surface. Your eye surgeon uses these measurements to program the computer-based laser used during surgery. During LASIK This laser eye surgery is done in an outpatient surgery center or your ophthalmologist’s office. Your eye surgeon uses a laser to reshape your cornea. Here is what to expect: Your eye will be numbed with eye drops. Your eye surgeon will place an eyelid holder on your eye to keep you from blinking. They will also place a suction ring on your eye to keep it from moving. You will feel pressure like a finger pressing firmly on your eyelid. At this point, your vision will go dim or black. Using either a device called a microkeratome or a laser, your ophthalmologist makes a paper-thin flap in the cornea tissue. Then they lift and fold the flap back. You will be asked to stare at a target light so that your eyes will not move. The ophthalmologist then reshapes your cornea using a laser. The laser is a special instrument that has been programmed with measurements for your eye. While your ophthalmologist is using the laser, you will hear a clicking sound. After reshaping the cornea, your eye surgeon folds the flap back down into position and smooths the edges. The flap attaches on its own in 2 to 3 minutes, where it will heal in place. After LASIK The ophthalmologist may place a see-through shield over your eye or ask you to wear a shield while sleeping for a few days. This is to help protect your eye while it heals. You should plan to go home and take a nap or just relax after the surgery. For a few hours, your eyes may feel scratchy or feel like they are burning. You will be given special eye drops to reduce dryness and help your eye heal. Vision after LASIK About 9 out of 10 people (90%) who have LASIK end up with vision between 20/20 and 20/40—without glasses or contact lenses. It is important to know that LASIK cannot correct presbyopia. This is the normal, age-related loss of close-up vision. With or without refractive surgery, almost everyone who has excellent distance vision will need reading glasses after around age 40. To help with presbyopia, some people have LASIK to get monovision. This means one eye is left slightly nearsighted and the other eye is adjusted for distance vision. The brain learns to adapt so that the nearsighted eye is used for close work, while the other eye sees distant objects. Monovision is not for everyone. To see if you are able to adapt to this correction, you will probably want to try monovision with contact lenses first. What Are the Risks of LASIK? Like any surgery, LASIK carries risks of problems or complications you should consider. Some people have side effects after LASIK that usually go away over time. However, in rare cases, they may not go away. For example, almost everyone who has LASIK will have dry eyes and changing vision during the day. These symptoms usually fade within a month. For some people, though, they may take longer to disappear or they may remain. Other side effects, either temporary or permanent, could include: eye pain or discomfort hazy, foggy or blurry vision scratchiness, dryness, and other symptoms of dry eye glare halos (rings) or starbursts around lights double vision decreased ability to see in low light light sensitivity small pink or red patches of blood on the white of the eye that go away over time Other rare risks include: eye infection worse vision than before LASIK, even with glasses or contacts (called loss of best-corrected vision) blindness Also, with LASIK, your vision may end up being under-corrected or over-corrected. These problems often can be improved with glasses, contact lenses, or additional laser surgery. If you are happy wearing contacts or glasses, you may not want to have refractive surgery. Together, you and your ophthalmologist can weigh the risks and rewards of LASIK. Considering LASIK? Learn more about this laser eye surgery Before choosing to have LASIK, it's important to do your homework to ensure you are a good candidate, understand the potential risks and benefits, and have realistic expectations about what your vision will be like after surgery and for years to come. To ensure the best possible outcome, be a well-prepared and informed patient by reviewing the resources below before you have LASIK. If these materials raise any questions for you, be sure to discuss these questions with your ophthalmologist. LASIK Surgery: Why All Patients Need the K Card (PDF 650K)If you have decide to have LASIK, it is important to keep a record of your pre-operation and post-operation eye information. Your ophthalmologist may need this information if you have other eye surgery later, such as cataract surgery. Bring this "K Card" with you to your appointment with your ophthalmologist to have it completed and keep it for future use. Questions to Ask When Considering LASIKIf you are considering LASIK, you should discuss with your ophthalmologist the benefits and risks — including quality of life issues — that could result from correcting vision with surgery rather than eyeglasses or contact lenses.

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The goal of LASIK is to correct your refractive error to improve your vision. LASIK eye surgery may reduce your need for eyeglasses or contact lenses. In some cases, it may even allow you to do without them completely.

It is important to know that LASIK cannot correct presbyopia. This is the normal, age-related loss of close-up vision. With or without refractive surgery, almost everyone who has excellent distance vision will need reading glasses after around age 40.

Aberrations cause the image formed by a lens to be blurred or distorted, with the nature of the distortion depending on the type of aberration. Aberration can ...

Also, you and your ophthalmologist should discuss your expectations for LASIK. People who have LASIK to achieve perfect vision without glasses or contacts run the risk of being disappointed. This laser eye surgery allows people to do most of their everyday tasks without corrective lenses. However, you might need to wear glasses for certain activities, such as reading or driving at night.

Today's cameras allow you to select an Auto ISO option. This allows the camera to choose the best ISO for a particular situation, basing its decision on your lens and the shooting conditions, and conveniently alter this from frame to frame.

Before choosing to have LASIK, it's important to do your homework to ensure you are a good candidate, understand the potential risks and benefits, and have realistic expectations about what your vision will be like after surgery and for years to come. To ensure the best possible outcome, be a well-prepared and informed patient by reviewing the resources below before you have LASIK. If these materials raise any questions for you, be sure to discuss these questions with your ophthalmologist.

Chris George has worked on Digital Camera World since its launch in 2017. He has been writing about photography, mobile phones, video making and technology for over 30 years – and has edited numerous magazines including PhotoPlus, N-Photo, Digital Camera, Video Camera, and Professional Photography.

On a tripod, however, you can use this kind of ISO and shutter speed in the knowledge that the camera won't move at all during the exposure. This is great as it allows you to record moving subjects, such as flowing water or traffic, with a pleasing blur.

Questions to Ask When Considering LASIKIf you are considering LASIK, you should discuss with your ophthalmologist the benefits and risks — including quality of life issues — that could result from correcting vision with surgery rather than eyeglasses or contact lenses.

Fiber Optic Lighting. In data transmission applications for fiber optics, one device is connected by to another, each one acting as a transmitter or receiver.

For glass, the range of refractive indices is usually between 1.4 and 1.7. Different types of glass have different refractive indices, so this property can be ...

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If you are happy wearing contacts or glasses, you may not want to have refractive surgery. Together, you and your ophthalmologist can weigh the risks and rewards of LASIK.

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With LASIK, your ophthalmologist uses a laser to change the shape of your cornea. This laser eye surgery improves the way light rays are focused on the retina. LASIK is used to treat myopia (nearsightedness), hyperopia (farsightedness) and astigmatism.

Shutter speedchart

He has written about technology for countless publications and websites including The Sunday Times Magazine, The Daily Telegraph, Dorling Kindersley, What Cellphone, T3 and Techradar.

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There may be times, however, when you want to overrule this, perhaps for creative reasons. So, it's good to understand what's happening.

When shooting in trickier conditions, you may need to raise this ISO, perhaps to ISO 3200 or 640000 – or maybe even higher. Doing this will give you a faster shutter speed to work with, which in turn helps you to end up with a sharp image.

LASIK is a type of refractive surgery. This kind of surgery uses a laser to treat vision problems caused by refractive errors. You have a refractive error when your eye does not refract (bend) light properly.

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LASIK Surgery: Why All Patients Need the K Card (PDF 650K)If you have decide to have LASIK, it is important to keep a record of your pre-operation and post-operation eye information. Your ophthalmologist may need this information if you have other eye surgery later, such as cataract surgery. Bring this "K Card" with you to your appointment with your ophthalmologist to have it completed and keep it for future use.

To give an example, a sensitivity of ISO 100 may require a shutter speed of three or four seconds in a particular situation. This is too long to be useful when hand-holding the camera; the result will be a blurry image.

Also, with LASIK, your vision may end up being under-corrected or over-corrected. These problems often can be improved with glasses, contact lenses, or additional laser surgery.

Our photography cheat sheet below can help you to understand the ISO scale, and when to use different ISO settings for different subjects.

Image noise, however, is likely to be more visible. This gives images a colored, grainy texture, and it can obscure details, so you want to keep this to a minimum.

Some people have side effects after LASIK that usually go away over time. However, in rare cases, they may not go away. For example, almost everyone who has LASIK will have dry eyes and changing vision during the day. These symptoms usually fade within a month. For some people, though, they may take longer to disappear or they may remain.

If you're using your camera on a tripod, you can use a lower ISO setting than you would normally be able to, which will help with the quality of your images. This is because the camera is not subject to any movement during the exposure as it's not being held by the user, which makes longer shutter speeds practical.

The best low-light cameras are more capable of shooting in dim conditions than other cameras, but as a general rule, you want to stick to the lowest ISO possible, as this will give you the cleanest images.