Hi a friend of mine wears contacts.. but he puts 2 in his eyes... because he has bad eye sight and he wants to wear color contacts but color is only available in certain prescriptions... so what he does is put the color contacts over his clear ones... he said it doesn't hurt his eyes and it feel the same as if he just had one in... but can this hurt his eyes... like can it make him go blind one day??

I have only found one instance where 'piggybacking' is implemented and it is as follows, but these are obviously custom fitted for that purpose. He may not feel it 'hurts' his eyes physically, but could be doing some damage that is not apparent to him.

Contact Lenses for Keratoconus

A practitioner who is familiar with hard-to-fit cases is likely to fit a keratoconic patient with an GP (gas permeable, also known as RGP or rigid gas permeable) contact lens. Unlike a soft lens, it retains its shape on the cornea. However, when the cornea is so irregular it needs cushioning, a piggyback technique may be best. Piggybacking means you wear two lenses on each eye. A soft lens drapes over the cornea and a GP rests on top.

I've only heard of piggybacking done with a RGP (rigid gas permeable) lens and a and a soft lens. This is a horrible idea. Not only can this effect his eyes in a negative way, but he is ruining both lens by doing so. Sometimes if you have an astigmatism you have to sacrifice the colored lenses. I just had to do this myself. You need to convey to him how serious this is, and he needs to grow up and take his health into consideration far above his desire to change his eye color.

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Originally Posted by ChihuahuaMomma

I've only heard of piggybacking done with a RGP (rigid gas permeable) lens and a and a soft lens. This is a horrible idea. Not only can this effect his eyes in a negative way, but he is ruining both lens by doing so. Sometimes if you have an astigmatism you have to sacrifice the colored lenses. I just had to do this myself. You need to convey to him how serious this is, and he needs to grow up and take his health into consideration far above his desire to change his eye color.

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Oh OK I will def let him know that... I told him he can go blind... to scare him... but can he really go blind... or he is just ruining his soft contact lenses...

I don't know if this will make him go blind, but it's a good way to get infections..