Are 1year disposable contact lenses safe to use? How to avoid GPC?

[Kitty_Pich]

I'm a contact lenses user. I start using it for around 4-5years. I also try some pairs of Renu monthly disposable with Renu MPS, but never use Renu eyedrop. I sometimes use V.Rohto eyedrop before and after use contact lense. Later, I use 1 year disposable contact lenses because they come with beautiful colors and economical. Those are GEO brand from Korea. Now m using the 5th pair. I use it almost everyday around 10-12hour. I wonder why the recommendation just 8hours. Are their some tip To prolong using time? Why solution need to discard after 90days? When we put on broken edge contact lenses in the eyes, what will it harm? How to avoid GPC? Dry eye or other problem? Are their tip to take care of lenses case? I want to know all of these to prevent problem happen cos I want to use contact lense many years more. I really need them much.

[Kitty_Pich]

Update: For GEO contact lenses. When I try WMM-500 power -5.25 (both) 6months after I have eye check -5.525 n -5.00. It was comfortable for almost 1year till I throw them away. But, when I try WFL-A15 -5.50(both)  right after I check my power during my 9month pregnancy -6.00 n -5.50 (astigma 0.25, 0.50). I feel unwell with it even my 1sf try to use with Renu eyedrop too.

[JohnHaganMD]

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[Kitty_Pich]

Can u give me some part that u can answer?

[Kitty_Pich]

Can u give me answer for part that u can?