UK Keratoconus Self-Help and Support Association

Why it is so dificult to obtain information on how the eye reacts after a long day using hard contact lenses?
Why glasses are so inferior in quality?
How to improve this?

My opticians does not know very well the KT situation, and prescription for glassses is usually repeated or in bad shape.

Thanks

Hi Camilo and welcome to the forum,
Contact lenses tend to mould the eye into a different shape over the course of a long day. I make my appt for glasses as late in the day as possible, so that the prescription is right for when I take my lenses out. I've had grafts in both eyes, so get good vision with glasses - for most people with KC, glasses vision won't be as good as with hard lenses but it's often better than nothing!
Anne

Thank you. Anne. My first post was incomplete and in the middle of the night with glasses showing doble image...

It is incredible. My opticiann ask me to stay 1-2 days without contact lenses to prescribe the glasses and it seems absurd as you confirm me.

I have KT since 45 years ago and fortunately they seem are static. I have splendid vision with hard contact lens supplied by a chain opticians brand in Germany.
Use them 12 hours a day without significante problems. Twice during the semester some little problems that are cleared pulling out the lens for a day...

My last glasses were made six months ago and one lens is giving me double vision. The other is also poor in vision...
Usually I feel that glasses are not well balanced: in one eye the distance to the book, for example, is shorter for example, than the other.

I will conclude that my next glasses will be made with your conseil: late in the day, and after using contact lenses...

Yes, for people with KC who wear glasses as a back up after all day in lenses, that's really the only way of getting anything approaching a useful prescription. Leaving the lenses out for 1 or 2 days would produce a completely useless prescription for our purposes.
Good luck!
Anne

I would just like to add my agreement to Anne's opinion as an Optometrist.

Although leaving rigid lenses out for a few days is useful for an ophthalmologist examining the health of your eyes, it is really useless as far as getting a useful spectacle prescription. All it does it give you a prescription that works after you have left lenses out for a few days..... when you really wear spectacles straight after removing lenses at the end of a day.

What you are experiencing is called spectacle blur and is, as Anne says, caused by the rigid lenses changing the shape of your cornea. The longer you leave lenses out before testing, the more the cornea "demoulds" and changes in prescription.

Therefore, also be aware, if you get your glasses prescription checked at the end of a day, you will find the vision changing if you do,for some reason, wear your glasses the next morning and then leave your lenses out for a few days.

Lynn