Inner eye lens replacement, my wife is investigating surgical methods to improve!

Inner eye lens replacement, my wife is investigating surgical methods to improve her eyesight.?

Having had eye tests she has been told that her prescription is too high for laser surgery. The best option seems to be to have the inner lense of the eye replaced with another lense of an appropriate prescription. We live in the UK.
My questions are as follows,
a) what in the eye has altered to give her a reading of +5.75 and will it continue to alter after the operation.
b) are there different materials that can be used in making the lenses, if so what are they and why would you choose one compared to another? Is it the case that one may be more economical, if so would it be beneficial to have the more expensive one.
c) has anyone experience of this surgery and what are your views, (no pun intended).
Sorry it is a long winded question but you will realise at this time all information is vital.

As the eye ages, the lens gets bigger. It gets bigger by adding layers onto the outer portions. This occurs inside a capsule that surrounds the lens fibers and it's inside this capsule or bag, that the new little plastic one is placed.

Since the lens gets bigger with age, it also gets stronger. So every few years...got to get new glasses because these things just don't work any more.

The numbers:
The eye is a simple camera. It is supposed to be focused at optical infinity...way off there 20-30 ft or so. If it is, that's called

Emmetropia.

If the light rays from way off there at infinity are focused in front of the retina, that means that the eye is stronger than the Emmetropic one. These people can see near-by pretty well, as they are already focused near. These are Myopes, or Myopic eyes or nearsighted eyes.

If the eye lens system (cornea and lens together) is weak, then the light rays from infinity don't get bent soon enough to hit the back of the eye, and they focus behind the eye. These people can bend their own lens as if in trying to read, and are then able to see at a far distance. But it takes work. So they get tired. To read, on top of all the work it is to see at a distance, they have to crank in even more energy, so they can't read for long periods without getting all sleepy, mind wanders...etc.

The number is according to the distance. It's equal to one over the distance in meters. or P=1/d

So if she were a +1.00, she'd have to work that much to see at a distance. That's 1/1 or one diopter.

For near sighted people, if focused at a meter in front of her, she'd need to move it out...she'd wear a -1.00. If she were focused at a half meter in front of her, -2.00. A third of a meter...-3.00. A forth of a meter -4.00.

With hyperopes, she needs to crank in +5.75 of bending power to see at a distance! To read she needs another +3.00 or so.

Since the lens gets stronger with age she'll become less and less far sighted and she'd use less and less power as she gets older. She'd probably only get about 3 diopters towards normal which would give her a +3.00 by the time she's 80 or so.

Correcting a hyperope with an intraocular lens is just simple cataract surgery, without the cataract. It's the same surgery, but the lens that's placed inside the eye to replace the one that's being removed, is stronger than the 'normal' ones.

So if a normal lens being placed in the eye is a +20.00 which is more or less what they use, she'll need a +25.00 or 26.00 power lens and she'll see just fine. And it's no different than placing the normal one...none.

The phakic IOL's that are being used are lenses placed in front of the normal lens without removing the normal lens. The complication, or main complication is cataract, which is just a foggy lens. So if one is going to invade the intraocular space, why not do it once and be done? Two invasive procedures just increases risk.

These lenses are 'permanent'. Once they have been placed, even 'in the bag' which is the way it's done now, it scars way out to the sides, and to remove one is really a lot more difficult than putting one in. Ya have to cut the little arms, remove scar tissue..., probably remove portions of the old capsule...getting risky...things go wrong...retinal detachments, glaucoma...stuff like that.

When the new lens is put in the eye, that's the new fixed focus lens. It's a piece of plastic or polythis or polythat or silicone or ? Whatever it is, that's IT. So if it's too strong, one is a little bit nearsighted. If it's still too weak even after adding all that extra power, she'd still be a little far sighted and need to over correct the difference...Which would be like a +1.00 or a +0.75 or whatever. She'd still be able to see the clock across the room, the watch...etc. a LOT better than she is now where she can't see anything without the glasses, and losing them is just a nightmare cuz ya can't find them cuz ya can't see well enough....very, very frustrating.

The part that's new, is doing IOL's to people that don't have cataracts. The don't have that 'condition'.

Just replacing the clear normal lens with a new lens. And yes there are multifocal lenses, but so far, these people have lots of glare at night with car lights...stuff like that. Then again, some are pleased as can be.