Examination for eyeglasses and contact lens prescriptions

What is the main difference between soft, semi-hard and hard lenses?

The difference between them is in the type of the material that they are made from. Soft lenses are made from material that is most permeable to oxygen, which is why they are most comfortable to wear. These types of lenses are used by 99 percent of those who wear contact lenses. Semi-hard lenses are less permeable to oxygen and are used primarily by patients who suffer from keratoconus or high degrees of astigmatism that are not possible to correct with soft lenses. Hard lenses are no longer used because they have been entirely replaced by semi-hard lenses.

Which lens is the most suitable for me?

We cannot provide an answer to this question in advance and there is no general answer. People are different from one another and each person has individual needs. This is why we select the most suitable contact lenses for every person on the basis of an eye examination and a discussion about their lifestyle.


Can I use soft contact lenses if I suffer from astigmatism?

Yes. There are different types of daily, 14-day and monthly soft disposable contact lenses to correct astigmatism.


What is the risk of using 14-day contact lenses for one month?

The oxygen permeability of contact lenses decreases over longer use, so that more and more proteins and lipids accumulate from teardrops. This increases the risk of developing bacterial cornea infection. Due to there being a worse provision of oxygen for the cornea, chronic changes in the form of an expansion of thin arteries that gradually damage the cornea can occur. This happens because the body tries to improve the provision of oxygen to the corneal tissue. We cannot see this with the naked eye but it can clearly be seen in many long-term contact lens users under a microscope.


Can I swim while wearing contact lenses?

You must be careful that the lenses do not come into contact with water, or if they do, they must be replaced with new lenses. If the lenses are not replaced, bacterial infection of the eye can develop, which can result in serious corneal damage. For this reason, it is recommended to use disposable day lenses that are thrown away after each use.


Can I sleep with contact lenses?

Contact lenses are a foreign object for your eye, so we recommend that you remove them before going to sleep. This is also advisable so that are sure to mechanically clean them. Without regular (daily) cleaning, proteins and lipids accumulate, which increases the possibility of an eye infection. It is also unhealthy to leave disposable day lenses in the eye for 24 hours.


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