Contact lens usage detai. My problem!

I have site right eye-sph (-2.75),cyL (-1.00),axis (180)left eye sph (-2.00),cyL (-0.75),axis (10), and I like to use colour contact lenses for site but I need to buy for less prise and when I took other suggestions they said that yearly once lenses are below 2000 rupees and monthly are costly but when I asked a doctor she said that yearly lenses causes blindness by decreasing oxygen supply to eye layers is it true and if it is true then give me suggestion how to use to get Oxygen to eye layers even after using yearly lenses example like removing for every 5 hours and then inserting or using oxygen containing drops and I have already used 6months fresh look 1 year guarenty grey contact lenses without site there was redness seen in starting and rarely and after this I have checked retina test for my eyes there was no problem so please now suggest me solution for my problem