Posts Tagged ‘Eyes Vision’

A Guide to Ophthalmic Equipment

Thursday, November 15th, 2012

Ophthalmic equipment and other eye-care tools are some of the most finely hones in all of medicine. Think about how exact they would need to be in order to make the minuscule corrections that you need to measure and correct your eyesight.So, even if you are not looking to pursue a career in eye care, you may want to learn more about the equipment that will be used on your eyes and their purpose.

• The eye chart – Probably the most recognized diagnostic tool in the eye care technician’s arsenal. It is used to test your visual acuity. Basically, this is a test of how clear your vision is and to test the sharpness of your retinal focus. It also helps to test the brains ability to interpret the data correctly

• The Phoropter – This is the giant machine that hangs from an articulated arm and probably reminds you of a medieval torture device. It has a face plate with two apertures for you to look through and the technician will ask, “Better or worse?” Inside those apertures are different lenses that are used to measure your refraction error and help to narrow down the proper prescription for your eyes.

• The cover test – This is mostly given to children but can also be used on adults. One eye is covered for a short length of time. Then when it is uncovered both eyes are watched for movement. If there is a “Lazy eye” it will start to wander inwardly or outwardly as it tries to compensate for its visual disparity. This can uncover defects such as Tropia, the constant misalignment of the eyes and Phoria that is only evident when both eyes stop focusing on the same target.

• Glaucoma test – This is the one that everyone, including me, dreads the most. You put your chin into a machine that holds it in place. You are usually looking at a barn in a pasture when they blow a puff of air into your eyes. It is testing the fluid pressure in your eye to make sure that it is draining properly and not building pressure that would impinge on your optic nerve.

Those are the most common tests that you will have to sit through on your yearly visit to the eye doctor. No one is claiming the process is pleasant but it certainly beats the alternative. Plus, on the bright side, many eye care technicians have a variety of sucker flavors for you to enjoy after the tests.

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How Lasik Eye Surgery Works?

Thursday, August 4th, 2011

If you want to enhance your vision in order to enable you to see properly without having to use your glasses or eye contacts, then believe me when I tell you that there is a way out. There is a type of surgery referred to as LASIK which can help you to achieve this aim.Photorefractive keratectomy (PFK), Radial keratomy and Lasik vision surgery are all current procedures but the medical experts consider the latter as being the most affordable and fastest one.

After a Lasik vision surgery, 99% of the patients don’t need their glasses anymore while the same percent is used to determine the visual acuity. This type of surgery is a delicate mixture of laser treatment and surgical procedures.

At first the surgeon creates a flap and lifts it to one side so that he can use the laser to reshape the cornea. There are a few risks involved here because the major optical function of the eye is altered by this refractive surgery.

That’s why it’s very important that your surgeon explains you all the risks and complications, the side effects and also the limitations of this procedure.

Lasik vision surgery won’t interfere with your eye’s aging process. If you choose to have this procedure because of occupational vision requirements then there’s a big chance that both you and your boss will be pleased with the results.

In order to be a good candidate for the surgery, the patient must be at least 18 years old and must have a normal corneal structure. Also, before the procedure the lenses are strictly forbidden (3 weeks for soft lenses and 4 weeks for hard ones).

The procedure is not performed on patients that suffer from any condition that can affect the corneal wound healing (immunosuppression, corticosteroid use, etc.) or on patients that have untreated superficial eye disease.

Diagnostic Overview

An improvement over PRK, Laser-assisted In Situ Keratomileusis removes a stromal layer by flattening the curvature of the cornea. Using a microkeratome, the doctor creates a corneal flap and retracts this tissue less than 1/3 of the thickness of a human hair in order to access the corneal stroma and use the excalculated measurements.

Next, he rolls back and repositions the corneal flap.

Lasik surgery provided great results in correcting residual myopia that usually appears after cataract surgery. It is safe (safer than PRK), stable and predictable, it causes less post-op discomfort and involves only a few minor side effects.

Not to mention that after the surgery, the patient has no corneal haze and there’s no need for complicated postoperative care. Even so, you should be aware that any complications are more severe than the ones with PRK because the laser works on a deeper level of the cornea.

After Lasik vision surgery, the DLK must be taken into consideration because this is a non-infectious, peculiar and inflammatory reaction in the lamellar interface.

To be more precise, for a multi-factorial cause in the first week after the surgery may occur a diffuse, white, culture-negative, granular lemellar keratitis.