Your refractive error
Right eye spherical -3.50 Cylindrical -0.50 Axis 170
Left eye Spherical -2.75 Cylindrical -1.00 Axis 100
You can use spherical lenses as your cylindrical power is equal to less than 1 dioptre. The contact lenses do correct the cylindrical power of 1 dioptre or less by replacing the anterior surface of cornea
as the first refractive surface. Toric lenses are compulsory if the compulsory if the cylindrical lens power is more than 1 dioptre.
In your case you can go for spherical lenses only.