Eye itching that starts suddenly is often due to allergy, dust exposure, dryness, pollution, or rubbing the eyes too much. Since it began only yesterday and you are not getting relief with the eye drops, it may still be a mild irritation, but the exact reason is important before using more medicines. Medicines/treatment should be taken only if advised or prescribed by your doctor. Try not to rub the eye, as this can increase irritation and redness. Washing the eye gently with clean water and using a cold compress for a few minutes may help soothe the itching. If you spend long hours on screens, give your eyes regular breaks and avoid smoke, dust, or strong fragrances for now. Do eye exercises and keep your hands clean before touching your eyes. It is better to get checked if the itching becomes severe, both eyes get affected, there is swelling, thick discharge, pain, blurred vision, or sensitivity to light. If symptoms stay the same for more than a couple of days, an eye doctor can identify whether it is an allergy, infection, or dryness and guide proper treatment.