negative effects of high order aberrations

[safeir]

sirs
i live and work in one of so called developing countries . in my country , the traditional lenses that are imported from old Chinese factories , are still available and sold . rarely you can find a lab that provides free-form manufactured lenses .
i understand well that free form has corrected - to a great deal - high order aberrations . but i need to know if there are bad or negative effects on the eye , from being exhausted due to wearing these old fashioned lenses (not made by free form) and that are still suffering from a great deal of high order aberrations ...!
can any specialized nerd here list these negative effects ?
thanks in advance

[braheem24]

I'll let the nerds reply but I just wanted to say Congratulations on your new country and I've been to Egypt It's not third world.

Mabrook!

[safeir]

I'll let the nerds reply but I just wanted to say Congratulations on your new country and I've been to Egypt It's not third world.

Mabrook!

really , i am grateful for your gentleness .
just one last thing before you reply , please be aware that i am indicating to the aberrations of the ophthalmic lenses , not the aberrations of the eye it self . such as coma, oblique astigmatism , curvature of the field. not any aberration from which the eye might suffer.
thanks a lot

[RIMLESS]

Higher-order aberrations make up about only 15 percent of the total number of aberrations in the human eye. Conventional lenses work fine under most conditions. I recall a study where they attempted to correct all of the higher order aberrations via custom vue lasik and people actually saw worse. Don't sweat free form lenses, I think they're just a little bit ahead of the times for now. I think the future will be some form of free form refraction with free form lenses. But I recall a similar ranting with contrast sensitvity. Just one mans opinion.

[Robert Martellaro]

safeir,

Higher order aberrations in progressive addition lenses, coma and trefoil, can be managed but not eliminated. I believe this has more to do with the PAL design (rate of power change, soft/hard boundaries), and not the manufacturing platform, although the lower order aberration you mentioned (oblique astigmatism) can be minimized with capable software on a freeform/cnc platform.

[Wes]

Before the advent of aspheric and freeform lenses, best-form or corrected-curve lenses were used to reduce off axis power error and induced oblique astigmatism. Google Tscherning's ellipse, and look at Darryl Meister's paper on ophthalmic lens design.

[RIMLESS]

Is it my imagination or did the entire concept of corrected curve lenses go down the drain at some point. Seems like the only criteria for finished SV lenses is to make them as flat as possible?