Pros and cons of online dating article. The Pros and Cons of Writing a Novel in Present Tense.



Pros and cons of online dating article

Pros and cons of online dating article

It's potentially a huge market: But while the technology, which has been available in Britain since , can produce excellent results, some of the , people who undergo laser eye surgery each year are unhappy about their treatment. Leading experts reveal the pros and cons of all the different methods Partly that's because it often costs more than promised.

More worryingly, the same report found that many clinics are not explaining the risks, nor are they warning people that, for some, laser surgery might not mean an end to glasses for good. While it can be very quick, it is not a trivial procedure. It can help treat shortsightedness myopia which occurs when the cornea, the front part of the eye through which light passes, is too steeply curved so that the light falls into focus short of the retina at the back of the eye where the image is interpreted by the brain.

Laser treatment can also help with longsightedness, where the cornea is too flat so that the light focuses beyond the retina; and astigmatism, where the cornea is oval, rather than spherical, which leads to blurred vision as it creates two focal points on the retina.

Laser surgery cannot help with age-related sight loss, which affects millions in middle age as the lenses in their eyes become less flexible. As with any operation, laser surgery is not risk-free. Side-effects such as dry eyes or seeing a halo or glare around lights at night occur in around five per cent of cases.

These do not necessarily reflect the skill of the operator and may occur because of the structure of the eye. In 50 per cent of cases, the clinic didn't check a patient's existing medical conditions - such as dry eye - which could affect the outcome.

Mistakes can occur The other key issue is training. The Royal College of Ophthalmologists has an Assessment of Competence which it can issue to members once they have proven themselves to be qualified at refractive eye laser surgery and have had suitable experience.

Yet not all surgeons operating on the High Street have this and mistakes occur. For example, too much of the cornea may be trimmed, which could result in permanent sight problems, although this happens in only a fraction of cases.

As well as the risk, many people believe the surgery will leave them with perfect vision for ever. They are not warned that as they age their eyes will deteriorate again because their corneas may change shape. An American study found that of people who had laser surgery, five years later 36 per cent needed glasses once more.

Since its introduction 20 years ago, there are now six different types of laser eye surgery. So what is the difference between them - and what are the risks? Here, we outline the main techniques, while Professor Gartry and another of the country's leading experts, Mr David Anderson, a consultant ophthalmic surgeon at Southampton University Hospital, explain the pros and cons of each.

Available since the Nineties, this is the most common laser treatment in this country, accounting for around 70 per cent of cases. First, anaesthetic drops are used to numb the eye.

Then a machine called a microkeratome is used to cut off a hinged flap from the top of the cornea - a bit like slicing off the top of a boiled egg. The surgeon then uses the laser to remove thin layers of the exposed section of the cornea to alter its shape. If treating shortsightedness, for example, the laser will be used mainly in the centre of the cornea. For long-sightedness, more tissue is removed from the outer part of the cornea. The laser part of the process takes less than a minute.

The corneal flap is then brought back over the eye. There is no need for stitches as the flap will be held in place by a natural vacuum. Corrects moderate sight imperfections with minimal discomfort. Normal vision returns within hours and patients can return to work after about two days. There is a risk of complications because the procedure includes manually cutting into the cornea. Sometimes the flap of the cornea may detach altogether and there is a risk of corneal scarring, all of which can lead to long-term sight problems.

Cutting into the cornea can also lead to it being weakened in the long-term, which can lead to vision distortion. It is not recommended for those in the police or military because even slight trauma could detach the cornea. Long and short sight, plus astigmatism. It is not suitable for anyone with thin corneas or for people who regularly play contact sports, such as rugby, because the cornea can be weakened by the process and therefore could detach more easily if the eye is hit.

This is the original form of laser surgery. Available since the late Eighties, the surgeon first inserts anaesthetic drops to numb the eyes, then manually scrapes off the epithelium - the thin, protective layer of cells covering the cornea.

The laser is then used to shape the cornea to improve the ability to focus. The lasering takes seconds and the whole process takes around 20 minutes. Afterwards a protective 'bandage' contact lens is placed on the eye to seal it while the epithelium grows back, which takes between four and seven days. Because no flap is cut into the cornea, it's less invasive than other techniques such as LASIK, which means there's a lower risk of the cornea weakening.

Rarely performed any more because there are other superior techniques that are less painful and more precise. It can be painful for two or three days and, although normal vision will be restored after a day or two, it can be slightly blurry for up to three months while the epithelial cells heal. Patients need a week off work afterwards. People with low prescriptions for short and longsightedness and astigmatism who are not suitable for other forms of laser surgery.

This is very similar to PRK, but first the epithelium is softened with alcohol for 30 seconds before it is moved to the side by the surgeon. The cornea is then lasered and the epithelium is replaced. A contact lens will be put in for four to five days while the epithelium heals.

This is a less aggressive form of PRK. The epithelium is partially retained, so will provide faster healing. It can also work well for people who have a high prescription, as generally the higher the prescription, the more cornea needs to be removed. The problem with other systems, such as LASIK, is that cutting a flap in the cornea means the surgeon has less corneal tissue to work with to properly remedy the problem.

It takes longer for full vision to return than after LASIK - around a day or two - and is more uncomfortable. People who have thin corneas and high prescriptions for long or short-sight or astigmatism, as none of the corneal tissue is removed before the laser treatment begins. The laser creates thousands of tiny bubbles within the cornea which helps the surgeon lift up a hinged flap.

The laser means the surgeon has greater control of the size and thickness of the flap than with using a blade. Once the cornea is exposed, it can be lasered as usual and the flap replaced straight afterwards. Because of the precision involved in cutting the flap, there is less risk of long-term damage to the cornea than with the traditional LASIK method, which results in more variable flap thicknesses.

It is also more comfortable for the patient. Vision is restored within hours and the patient can go back to work within two days. As the surgeon can determine the thickness of the flap made by the laser, this can be used on people with slightly thinner corneas who might not be able to have traditional LASIK techniques.

After anaesthetic drops have been put into the eye, a very thin layer of the epithelium is manually separated from the surface. The lasering is then done as normal. A contact lens has to be worn for a few days while the epithelium heals.

Corrects short or longsightedness and astigmatism with minimal risk. Less painful than PRK. It takes around three days for normal vision to return and blurriness may continue for a few months as the epithelium heals. Computer software is used first to scan the eye to map precisely not just the defect causing the long or short-sightedness but also tiny imperfections that can further reduce the quality of vision sometimes called optical aberrations. This information is then fed into the computer operating the laser.

The laser then works on the cornea to correct the problem according to the individual's needs, rather than to standard measurement. This is the gold standard of laser eye surgery because it is an individualised treatment.

Poor sight is 95 per cent due to a misshapen cornea or length of the eye, which causes long or shortsightedness, but the remaining five per cent will be due to these tiny aberrations that this technique can spot and remedy.

Because the patient must first be scanned - although this only takes a few minutes - it takes longer than other techniques and is twice as expensive. Can be used for all prescriptions, but is especially beneficial for those who need very good vision, including at night.

The only laser eye surgery pilots and astronauts are permitted. Surgeon checklist There are now more than clinics - around two-thirds of them part of chains - offering laser treatment. When choosing a surgeon, The Royal College of Ophthalmologists suggests asking them the following questions: The Royal College asks surgeons to have done in two years before they get their Certificate of Competence.

The good eye laser guide: The pros and cons and other things to look out for Most watched News videos.

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6 Reasons Why I Quit Online Dating



Pros and cons of online dating article

It's potentially a huge market: But while the technology, which has been available in Britain since , can produce excellent results, some of the , people who undergo laser eye surgery each year are unhappy about their treatment. Leading experts reveal the pros and cons of all the different methods Partly that's because it often costs more than promised.

More worryingly, the same report found that many clinics are not explaining the risks, nor are they warning people that, for some, laser surgery might not mean an end to glasses for good. While it can be very quick, it is not a trivial procedure. It can help treat shortsightedness myopia which occurs when the cornea, the front part of the eye through which light passes, is too steeply curved so that the light falls into focus short of the retina at the back of the eye where the image is interpreted by the brain.

Laser treatment can also help with longsightedness, where the cornea is too flat so that the light focuses beyond the retina; and astigmatism, where the cornea is oval, rather than spherical, which leads to blurred vision as it creates two focal points on the retina. Laser surgery cannot help with age-related sight loss, which affects millions in middle age as the lenses in their eyes become less flexible.

As with any operation, laser surgery is not risk-free. Side-effects such as dry eyes or seeing a halo or glare around lights at night occur in around five per cent of cases. These do not necessarily reflect the skill of the operator and may occur because of the structure of the eye.

In 50 per cent of cases, the clinic didn't check a patient's existing medical conditions - such as dry eye - which could affect the outcome. Mistakes can occur The other key issue is training. The Royal College of Ophthalmologists has an Assessment of Competence which it can issue to members once they have proven themselves to be qualified at refractive eye laser surgery and have had suitable experience.

Yet not all surgeons operating on the High Street have this and mistakes occur. For example, too much of the cornea may be trimmed, which could result in permanent sight problems, although this happens in only a fraction of cases. As well as the risk, many people believe the surgery will leave them with perfect vision for ever. They are not warned that as they age their eyes will deteriorate again because their corneas may change shape.

An American study found that of people who had laser surgery, five years later 36 per cent needed glasses once more.

Since its introduction 20 years ago, there are now six different types of laser eye surgery. So what is the difference between them - and what are the risks? Here, we outline the main techniques, while Professor Gartry and another of the country's leading experts, Mr David Anderson, a consultant ophthalmic surgeon at Southampton University Hospital, explain the pros and cons of each.

Available since the Nineties, this is the most common laser treatment in this country, accounting for around 70 per cent of cases. First, anaesthetic drops are used to numb the eye.

Then a machine called a microkeratome is used to cut off a hinged flap from the top of the cornea - a bit like slicing off the top of a boiled egg. The surgeon then uses the laser to remove thin layers of the exposed section of the cornea to alter its shape. If treating shortsightedness, for example, the laser will be used mainly in the centre of the cornea.

For long-sightedness, more tissue is removed from the outer part of the cornea. The laser part of the process takes less than a minute. The corneal flap is then brought back over the eye. There is no need for stitches as the flap will be held in place by a natural vacuum. Corrects moderate sight imperfections with minimal discomfort.

Normal vision returns within hours and patients can return to work after about two days. There is a risk of complications because the procedure includes manually cutting into the cornea.

Sometimes the flap of the cornea may detach altogether and there is a risk of corneal scarring, all of which can lead to long-term sight problems. Cutting into the cornea can also lead to it being weakened in the long-term, which can lead to vision distortion. It is not recommended for those in the police or military because even slight trauma could detach the cornea.

Long and short sight, plus astigmatism. It is not suitable for anyone with thin corneas or for people who regularly play contact sports, such as rugby, because the cornea can be weakened by the process and therefore could detach more easily if the eye is hit. This is the original form of laser surgery. Available since the late Eighties, the surgeon first inserts anaesthetic drops to numb the eyes, then manually scrapes off the epithelium - the thin, protective layer of cells covering the cornea.

The laser is then used to shape the cornea to improve the ability to focus. The lasering takes seconds and the whole process takes around 20 minutes.

Afterwards a protective 'bandage' contact lens is placed on the eye to seal it while the epithelium grows back, which takes between four and seven days. Because no flap is cut into the cornea, it's less invasive than other techniques such as LASIK, which means there's a lower risk of the cornea weakening.

Rarely performed any more because there are other superior techniques that are less painful and more precise. It can be painful for two or three days and, although normal vision will be restored after a day or two, it can be slightly blurry for up to three months while the epithelial cells heal. Patients need a week off work afterwards. People with low prescriptions for short and longsightedness and astigmatism who are not suitable for other forms of laser surgery.

This is very similar to PRK, but first the epithelium is softened with alcohol for 30 seconds before it is moved to the side by the surgeon. The cornea is then lasered and the epithelium is replaced.

A contact lens will be put in for four to five days while the epithelium heals. This is a less aggressive form of PRK. The epithelium is partially retained, so will provide faster healing. It can also work well for people who have a high prescription, as generally the higher the prescription, the more cornea needs to be removed.

The problem with other systems, such as LASIK, is that cutting a flap in the cornea means the surgeon has less corneal tissue to work with to properly remedy the problem. It takes longer for full vision to return than after LASIK - around a day or two - and is more uncomfortable.

People who have thin corneas and high prescriptions for long or short-sight or astigmatism, as none of the corneal tissue is removed before the laser treatment begins. The laser creates thousands of tiny bubbles within the cornea which helps the surgeon lift up a hinged flap. The laser means the surgeon has greater control of the size and thickness of the flap than with using a blade.

Once the cornea is exposed, it can be lasered as usual and the flap replaced straight afterwards. Because of the precision involved in cutting the flap, there is less risk of long-term damage to the cornea than with the traditional LASIK method, which results in more variable flap thicknesses. It is also more comfortable for the patient.

Vision is restored within hours and the patient can go back to work within two days. As the surgeon can determine the thickness of the flap made by the laser, this can be used on people with slightly thinner corneas who might not be able to have traditional LASIK techniques. After anaesthetic drops have been put into the eye, a very thin layer of the epithelium is manually separated from the surface.

The lasering is then done as normal. A contact lens has to be worn for a few days while the epithelium heals. Corrects short or longsightedness and astigmatism with minimal risk. Less painful than PRK. It takes around three days for normal vision to return and blurriness may continue for a few months as the epithelium heals. Computer software is used first to scan the eye to map precisely not just the defect causing the long or short-sightedness but also tiny imperfections that can further reduce the quality of vision sometimes called optical aberrations.

This information is then fed into the computer operating the laser. The laser then works on the cornea to correct the problem according to the individual's needs, rather than to standard measurement.

This is the gold standard of laser eye surgery because it is an individualised treatment. Poor sight is 95 per cent due to a misshapen cornea or length of the eye, which causes long or shortsightedness, but the remaining five per cent will be due to these tiny aberrations that this technique can spot and remedy.

Because the patient must first be scanned - although this only takes a few minutes - it takes longer than other techniques and is twice as expensive. Can be used for all prescriptions, but is especially beneficial for those who need very good vision, including at night.

The only laser eye surgery pilots and astronauts are permitted. Surgeon checklist There are now more than clinics - around two-thirds of them part of chains - offering laser treatment. When choosing a surgeon, The Royal College of Ophthalmologists suggests asking them the following questions: The Royal College asks surgeons to have done in two years before they get their Certificate of Competence.

The good eye laser guide: The pros and cons and other things to look out for Most watched News videos.

Pros and cons of online dating article

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  1. One of the greatest challenges of the next era will be balancing protection of intellectual property in algorithms with protecting the subjects of those algorithms from unfair discrimination and social engineering. It is more difficult to create complex characters using present tense. It will be negative for the poor and the uneducated.

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