Posts Tagged ‘soft lenses’

Close to your eyes

To see from a medicinal perspective, contact lenses are worn to correct myopia (nearsightedness), hyperopia (farsightedness) or astigmatism. Besides, there are also contacts available to enhance or change the color of the eye with or without a prescription for visual correction. Theatrical contacts are also available to give the eye an appearance that matches a theatrical costume like a cat or zombie. We can say, contact lenses benefit many style person. 

Contact Lens Types 

- Soft Lenses: The most commonly prescribed contact lens are these gel-like containing plastics the size of the iris of the eye. More recently, the silicone hydrogel lenses have been introduced and are generally preferred by practitioners since they allow more oxygen to pass between the lens and the eye and are less likely to dry out. 

- Hard Lenses: Made from PMMA, which is plexiglass or lucite, these lenses are almost never used anymore but may be preferred or required by the patient. 

- GP or RGP Lenses: These are “oxygen permeable” lenses that are stiff, waterless plastics geared toward patients with presbyopia and a high astigmatism and a smaller than the iris of the eye. 

Contact Lens Wear

- Daily Wear contacts can be worn throughout the day but must be removed and cleaned nightly. Daily wear contact lenses come in different durations of wear time and must be eventually disposed of and replaced with a fresh pair. There are contacts that are disposed of daily, weekly or monthly depending on the preference as well as the visual needs of the patient. 

- Extended Wear contacts can be safely worn overnight or up to 7 consecutive days without removal. Continuous wear lenses are a type of extended wear that can be worn for up to 30 consecutive nights without removal.

There are also contact options available for more severe eye diseases and may need to be custom made to fit and serve the purpose of a special needs situation. Almost anyone these days can wear contacts, in fact 1 out of 5 people in the U.S. is a contact lens wearer. Whether the purpose for contact lens wear is a replacement to glasses or for more aesthetic purposes there is bound to be a healthy contact option available for everyone.
 

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Contact Lenses—to wear or not to wear

Contact lenses were invented by a German oculist, A.E. Fick, as early as in 1887 and were given the name of contact then. However, it hasn’t become popular until 1930s. The first generation contact lenses were made of glass which was easily broken and dangerous for people’s eyes. Contact lenses become more and more popular since keratoscope were invented. Nowadays, more and more people choose to wear contact lenses rather than the tradition glasses. Are contact lenses comfortable and good for people’s eyes? Is everyone capable to wear contact lenses?

 

The advantages of contact lenses count for the popularity of them. People tend to wear contact lenses when they are having sports or having fun. Contact lenses bring freedom for eyes. One can does his business without any restriction. In addition, the things are seen more like the real ones through the contact lenses. What’s more, many girls choose contact lenses in order to make their eyes look bigger and sharper.

 

Despite of those truths, contact lenses are not suitable for everyone. The people with diseases in cornea can not wear contact lenses. Teenagers are advised not to wear contact lenses because of their incomplete developed eyes. The olds are not fit for contact lenses concerning the health of eyes. In addiction, soft contact lenses are somewhat foreign objects to eyes. They may be uncomfortable for some people. In order to keep healthy, people need to clear lenses regularly. People who can not stick on the clear keep habit are not the ideal users of soft lenses. Overuse of lenses can also lead to eyes’ tiredness. People in the environment of dusts and polluted air can not wear contact lenses either.

  

One should think carefully before he chooses contact lenses, and receive a careful check from Ophthalmology clinic. And even for ones who are fit to soft lenses, they can’t wear contact lenses all the time or the entire place. Health of eyes is more important than one’s appearance.

 

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Lasik Eye Surgery: Before & After Lasik Eye Operation

Before laser eye surgery, an interview is carried out to determine your personal suitability for eye surgery and to determine which type of operation may suit you and give an idea of the likely results. The next stage is to carry out a thorough eye test to determine a current up to date eye prescription and to take precise measurements of the eye structures.
It is normally recommended that a friend for this examination accompanies you as part of procedure involves using eye drops which dilate your pupil and blur your vision for upto 18 hours. Also it is advised to carry a pair of sunglasses on this day,as bright lights and dilated pupils can cause discomfort. If you normally wear contact lenses these can affect the corneal curvature and consequently it is necessary if you wear soft lenses to discontinue wear for at least one week prior to,and on the day of consultation, and with hard and gas permeable lenses to discontinue wear at least four weeks prior to and on the consultation day. Normally you need to complete a general health questionaire.You are then normally given a complete eye examination. Based on the result of these examinations your eye surgeon will advise you about the most suitable procedure for you,discuss the risks and also the alternatives. You also have the opportunity to ask any further questions you may have.
You can then decide whether or not to proceed to a surgical appointment.The advantages resulting from laser eye surgery are ability to see immediately on waking up, no more fumbling for your glasses in the dark, not having to wear glasses or contact lenses saving time and lots of money on opticians visits as well as trouble in maintenance and upkeep, improved self confidence in appearence (hopefully!), easier participation in sports leading to an overall improvement in feeling of personal well being. Most of the patients, who undergo laser eye surgery claim that they are satisfied with procedure and it has improved the quality of their life significantly and often state that they regret not having it sooner.
Lasik eye surgery is a laser surgery procedure for vision correction.The technique involves using a laser which is controlled by a computer to reshape the front surface of the eye(cornea). As with all surgery a pre-op consultation is required to ascertain the best eye surgery for the individual.In normal vision light enters the eye and is bent by the cornea and focussed to produce a sharp image on the back of the eye the retina. When a person has a refractive/visual error like short or long sight the light is bent such that a blurred image is produced.
Lasik eye surgery can be used to correct short sight, long sight and stigmatism (correct spelling astigmatism).Older patients who have presbyopia/age related near vision problems cannot have their vision improved with this procedure. The cornea has an alcohol solution applied to help lift the epithelial flap which is then cut(a fine layer about 50 microns thick ) with a Trephine blade (ALSO CAN BE CUT WITH A LASER BUT AGAIN IT IS A SIMILAR PROCEDURE ) , but not completely removed and remains hinged on one side allowing it to be replaced inthe same position. The surgeon raises the flap, and an excimer laser shapes the the cornea to the dimensions determined at the pre op consultation.The eye surgeon replaces the epithelial corneal flap, within minutes, natural forces hold it in situ, and the eye surgery is finished.The surgery as with LASIK takes approximately 15 mins each eye. However recovery normally takes a bit longer approximately one week and there is usually some discomfort for the next 48 hours.
This is just a general outline of the what happens after laser eye surgery procedures following refractive surgery (as there are wide variations depending on individual needs and surgery techniques).Patients are normally provided with antibiotic eye medication and lubricating eye drops to be used in the days immediately after surgery. It is common and good procedure for the eye surgeon who performed your operation to exam your eyes the day immediately after any eye surgery. Further appointments are then generally advised at the desired intervals. In the first few days and hours after surgery it is important to refrain from touching or rubbing the eyes and to try and rest as much as possible and to use any medication prescribed.Protective eye shields are normally provided to prevent rubbing of eye during the night whilst sleeping.Within 3-4 days most normal day to day activities like housework,driving and shopping can be resumed. After 2-3 weeks Most sporting activities can be resumed ,however hard contact activities such as boxing,football martial arts are best left for 3 months or more to ensure the best chance of full recovery.Following the post operation laser eye surgery aftercare program advised by your eye surgeon is very important in the overall.
Dr. Ajay Khanna who heads the Refractive Surgery & Vitreo Retinal Services at Dr. Om Parkash Eye Institute India has been performing Laser correction for specs since 1997.Dr. Ajay Khanna has been the earlier ones in the country to start with Thin Flap Lasik to treat patients with high myopia & thin corneas. This eye hospital was the first in the country to use for laser correction of specs, the state-of-the-art, Customized Lasik using NAVEX Quest -NIDEK CX III with Pentacam and OPD Scan.

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Kinds Of Contact Lenses

Even though they are great for your eyes, all contact lenses aren’t equal.  Although your doctor will help you select the best pair for your eyes, you should always know a little bit about the contacts that are available to choose from.  All contact lenses can be separated depending on their wearing schedule, purpose, material, and over transparency.

Materials
Contacts can be separated or best determined by their material.  Contacts are divided into two main groups – soft and rigid (hard).  Soft lenses are gas permeable to a certain extent, being further categorized by the amount of water they contain.  Soft contacts can have either a low, which is less than 50 percent moisture, or a high moisture content, which is more than 50 percent.  Rigid or hard contacts on the other hand, are much harder in material and are considered to be gas permeable.

Wearing schedules
Hard contact lenses can last for months, possibly even years before they need to be replaced.  Soft contacts on the other hand, have a schedule for replacement.  Some may need to be removed every 2 weeks, monthly, or even daily.  The more advanced contact lenses, such as Night and Day contacts, will allow you to wear them all day and all night.  Just like other contacts however, you will still need to clean them on a regular basis to ensure that the protein is removed.

Contact lens designs
The designs for contacts are divided into three areas – toric, spherical, and multi-focal.  Toric lenses are for those who have astigmatism, spherical is for short sightedness, and the correction of long sightedness, and multi-focal contact lenses are used in the correction of presbyopia.  All three designs have their distinct purpose, and you should always ask your optician before you rush out and buy one.

Many different purposes
As you may already know, contact lenses serve different purposes as well.  They can be optical, therapeutic, cosmetic or decorative.  Optical are the most common, as they are for the correction of vision and anomalies you have may have.  Therapeutic lenses are normally soft contacts that serve to protect your cornea.  They are also used as a reservoir for certain medicines that are used to treat various cornea diseases and malfunctions.

Decorative contact lenses are basically color contacts that produce various effects, such as rainbow colors, cat’s eyes, and so on.  Cosmetic on the other hand, are meant to change the overall appearance of your eyes.  Most types of cosmetic contact lenses are designed to enhance your overall eye color.

The type for you
With there being several different types of contacts available on the market, you should consult with your optician to find out which are the best for you.  If you don’t have astigmatism, you certainly wouldn’t want to get toric lenses.  If you don’t know anything about contact lenses, you may end up doing your eyes more harm than good.  Contact lenses are designed to correct your vision and often times protect your eyes, which is why you want to choose them carefully.

If you pick your contact lenses carefully, you’ll get the best type for your eyes.  Your optician will give you his recommendations during your fitting exam, and go over how you should care for your new contacts.  This way, even if you are new to the world of contacts, you’ll know what you should and shouldn’t do.  With the right type of contacts for your eyes – you’ll find vision to be a new and exciting world.

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Contact lenses for special eye problems

Some people have special eye problems and are not suitable to wear contacts. They require particular fitting by ECPs. Some ECPs specialize in these hard-to-fit patients. They provide more expertise and advanced equipments for contacts fitting.

RGPs are the right solution for Keratoconus since they are made of non-bendable materials. RGP contacts replace the irregular surface of a Keratoconic cornea. If the Keratoconus eyes are not suitable for direct RGPs, “piggybacking” is used. RGPs are covered over soft lenses so that they will be more comfortable. Keratoconus eyes may also use exclusively designed hybrid contacts, which combine a GP center and a soft ring around it. Another option of contacts for Keratoconus relates to the white sclera of the eye. These large diameter sclera GP lenses provide the irregular Keratoconus eye surface with a more stable and comfortable fitting.

Astigmatism eyes are also difficult to fit than common myopia or hyperopia eyes, since the eye cornea is not perfectly round. The current solution to astigmatism eyes are toric contacts, which should never rotate while blinking. They are provided in soft type, RGPs as well as customized style for high prescription. Hybrid contacts are another possible option for astigmatism.

Chronic dry eye is a common eye problem which is estimated to affect 20% of the Americans so that they may feel not so good with contacts. This eye problem has some usual symptoms, such as frequent tearing, red eyes, watery tears and feeling objects in the eyes. Since dry eyes affect the fitting of contacts, some doctors may treat these eyes using various methods. For example, using artificial tears and medicated eye drops can help people generate more tears and improve eye nutrition. Opticians may also insert punctal plugs into your eyelids’ inner margin, so as to hold most of your tears, which only costs several minutes and is painless. All these treatments aim to keep more tears on eyes. For people with dry eyes, traditional soft contacts are not the right solution since they absorb tears. New designed soft contacts do better in keeping moisture in the eyes. RGPs provide a better way to fit dry eyes, because they never “consume” moisture in the eyes.

A common inflammatory problem named Giant papillary conjunctivitis (GPC) also cause difficult contacts fitting. The protein excretions in tears bring a filmy coating on contacts, which affect comfort and good vision. Eye drops may help in reducing the possibility of GPC. Contact lenses should keep away from these proteins. A simplest way is to wearing soft daily disposable contacts, which will never be bothered by protein deposits. Another choice is GP contacts, which are more resistant to proteins deposits than soft lenses. Common soft lenses retain proteins easily even with frequent cleaning.

Since LASIK does not always resume a perfect vision, especially treating high prescriptions, contact lenses are still helpful after LASIK. This condition requires more consideration and trials for contacts fitting. Soft contacts, special RGPs and hybrid lenses are effective to provide a better vision after LASIK for high degree astigmatism. RGPs and hybrid contacts can help solve LASIK complications and excessive glare, as well as providing sharper night vision.

Presbyopia eyes are also hard to go with contact lenses. Opticians always use bifocal contacts and monovision lenses with precise fitting to correct this eye problem. The fitting process is time-consuming so that these lenses are more expensive. In fact, they deserve the high price.

Actually, most of the contacts dealing with hard-to-fit eye problems require more time and money. Eye practitioners must acquire more expertise to be competent.

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