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Contact lenses: Some things to understand before applying them

Contact lenses are medical devices that are applied to the anterior surface of the eye. In most cases, they are used as an alternative to glasses, for the correction of refractive defects, but there are also contact lenses intended for other medical or aesthetic applications.

Many people wear contact lenses without any problems. However, to avoid infections and other complications that are dangerous to sight, it is necessary to carefully follow the instructions for their correct application and maintenance. Equally important is preventive medical evaluation, which makes sure the patient is an appropriate candidate for contact lenses and is able to handle them safely.Contact lenses are now easy to buy online, even the prescription ones.There are many people who shop contact lenses at Designer Optics with just a few clicks.

Before applying them…

The type of contact lens prescribed determines the different ways of handling:

One of the first things to pay attention to is to recognize if a soft contact lens is upside down; if applied in the wrong direction, the device causes slight discomfort on contact with the surface of the eye, as it does not adhere correctly to the cornea, as well as not correcting the visual defect. One way to tell if the contact lens is upside down, without having to apply it first, is to keep it resting on your finger. If the bottom profile is curved, without protruding edges and the edge is facing inwards, this is oriented in the right direction. If not, the contact lens is upside down.

Application and removal

There are some differences regarding the correct procedure for fitting and removing a contact lens. Based on their anatomical characteristics, the type of lens (soft or rigid), the manual ability and the visual limitations to which they are subject, each patient must find the technique that is personally best. In all cases, these procedures require some training and practice on the part of the user. Each corrective lens is packaged in a sealed, sterile blister, which must indicate the correct strength and expiration date. The contact lens must be moist and clean, free from nicks, scratches or particles. If the device has a rough appearance, additional cleaning may be required. A damaged or dry contact lens should never be used.

How to apply contact lenses

Contact lenses are typically placed in the eye, placing them on the tip of the dry index finger, concave side up. The other hand can be used to keep the eye open.

Hard contact lenses should be placed directly on the cornea, while soft contact lenses can be placed on the conjunctiva, from where they can slide into place, blinking softly.

Problems can arise if the soft lens bends or flips, slips off the finger, or sticks tightly to it (typically if the finger is wet). When the contact lens enters the eye it should be comfortable. A short period of irritation can be normal if caused by a difference in pH and / or salinity between the saline solution and the tears. However, if the discomfort persists, the lens may be dirty or damaged. Removal from the eye, cleaning, inspection and proper orientation should solve the problem.

How to remove contact lenses

Improper removal of contact lenses can cause damage to the device and injury to the eyes, so care must be taken during this procedure.

– Rigid contact lenses can be removed by pulling the outer corner of the eyelid with a finger and then blinking. The increase in the tension of the eyelid margins against the edge of the lens allows to break the capillary action that makes it adhere to the corneal surface, while the other hand is cupped, under the eye, to receive it.

– A soft contact lens can be removed by pinching its edge with the thumb and forefinger. It is also possible to push it just enough towards the side of the eye to make it bend outwards. Using these techniques on a rigid contact lens could abrade the cornea. Alternatively, some small, flexible plastic tools, similar to tweezers or suction cups, specific for removing these devices may be used.

What has been explained above is a basic guide that is needed to be known by anyone who uses contact lenses.One more thing, clean your contact lenses before and after wearing them.Of course with the recommended special fluids.

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