Air Optix for Astigmatism 105 Axis

Georgiaonmymind · #1 (**permalink**) 10-28-2008, 04:33 PM

What does it mean when a prescription has an axis of 105? One hundred five what?

Xanthus · #2 (**permalink**) 01-25-2011, 05:55 PM

The axis is at what degree your astigmatism is at like the hands of a clock. I have a 75 degree axis, but with disposable lenses they only come in 80 or 70 degree. 80 degree axis works the best for my so that is what I get.

Pudgefisk · #3 (**permalink**) 01-26-2011, 10:46 AM

Quote:

Originally Posted by Xanthus

The axis is at what degree your astigmatism is at like the hands of a clock. I have a 75 degree axis, but with disposable lenses they only come in 80 or 70 degree. 80 degree axis works the best for my so that is what I get.

So would it be safe to say that if you're between axis numbers, the best thing is to round up? I know that won't work in every case, but if for example my prescription says that my axis is 75, but they only have either 70 or 80, I should just order lenses with an axis of 80?

Xanthus · #4 (**permalink**) 01-26-2011, 01:24 PM

Honestly, I am far from an expert. My guess is that aspect is more an art then science. But that is what worked for me !!

StairMaster71 · #5 (**permalink**) 01-26-2011, 02:19 PM

Quote:

Originally Posted by Xanthus

Honestly, I am far from an expert. My guess is that aspect is more an art then science. But that is what worked for me !!

I would hope that fitting contact lenses would be more scientific than artistic, but as long as it works for you, Xanthus, then that's what's important.

I'd like to open up this question to anyone who feels qualified to answer it.

Georgiaonmymind · #6 (**permalink**) 01-28-2011, 04:16 PM

Quote:

Originally Posted by Xanthus

The axis is at what degree your astigmatism is at like the hands of a clock. I have a 75 degree axis, but with disposable lenses they only come in 80 or 70 degree. 80 degree axis works the best for my so that is what I get.

Okay, so what does that mean? You have a 70 degree axis, so does it have something to do with a 70 degree angle?

Pudgefisk · #7 (**permalink**) 03-08-2011, 01:06 PM

Quote:

Originally Posted by Georgiaonmymind

Okay, so what does that mean? You have a 70 degree axis, so does it have something to do with a 70 degree angle?

Okay, now that I've done a Google search and found the answer right here on Lens 101, let me see if I can help.

When a person has corneal astigmatism, the cornea is kind of oval shaped, with a long axis and a short axis. If your cornea is shaped like an oval that's wider than it is tall, and the widest part is straight across, side-to-side, then that would be an axis of 0 degrees. If the longest part of the cornea is at 70 degrees from horizontal, like that picture up there, then the axis is said to be 70 degrees.

StairMaster71 · #8 (**permalink**) 03-08-2011, 02:19 PM

Quote:

Originally Posted by Pudgefisk

Okay, now that I've done a Google search and found the answer right here on Lens 101, let me see if I can help.

When a person has corneal astigmatism, the cornea is kind of oval shaped, with a long axis and a short axis. If your cornea is shaped like an oval that's wider than it is tall, and the widest part is straight across, side-to-side, then that would be an axis of 0 degrees. If the longest part of the cornea is at 70 degrees from horizontal, like that picture up there, then the axis is said to be 70 degrees.

Okay, I think I've got it. Thanks.

sylvanillo · #9 (**permalink**) 12-13-2011, 08:10 AM

I had the same type of problem with these lenses, being between 2 available axis (175). I just tried 170 and 180, 180 gave me a perfect vision.
They told me that they could do the exact prescription but only with rigid lenses, which seemed to be more difficult to fit in the eye, and are a one-year pair, so if you loose them...

luvbostonxo2's · #10 (**permalink**) 12-13-2011, 08:25 AM

Quote:

Originally Posted by StairMaster71

I would hope that fitting contact lenses would be more scientific than artistic, but as long as it works for you, Xanthus, then that's what's important.

I'd like to open up this question to anyone who feels qualified to answer it.

Welll being an ecp I'd say it's a combination of finnesse and science! Fitting Contact lenses requires complex mathematical equations, undrstanding the cornea and how it relates to CL materials, surrounding eye, tissue, curvature, diameter, tear film stability,etc!

Biology, chemistry and physiology!

Railfan · #11 (**permalink**) 12-13-2011, 09:55 AM

Quote:

Originally Posted by luvbostonxo2's

Welll being an ecp I'd say it's a combination of finesse and science! Fitting Contact lenses requires complex mathematical equations, understanding the cornea and how it relates to CL materials, surrounding eye, tissue, curvature, diameter, tear film stability,etc!

Biology, chemistry and physiology!

Wow. No wonder you need a doctorate.

Georgiaonmymind · #12 (**permalink**) 12-16-2011, 04:21 PM

Quote:

Originally Posted by luvbostonxo2's

Welll being an ecp I'd say it's a combination of finnesse and science! Fitting Contact lenses requires complex mathematical equations, undrstanding the cornea and how it relates to CL materials, surrounding eye, tissue, curvature, diameter, tear film stability,etc!

Biology, chemistry and physiology!

How much does the math help? It seems like no matter how much figuring I do I still can't cut lumber right.

That's probably just me.