Since your vision is 6by 6 in both eyes with glasses, the decrease in vision in in left eye may be due to change in contour of the cornea due to the spots.So you will have to wear glasses to overcome it.If there is no redness or irritation you continue the drops and please do not discontinue .The spots will persist but may get fainter with time
Next Steps
Continue using the drop as frequently as you need it as it will keep your eye moist
Health Tips
If there is any redness or discomfort seek immediate consultation.Go for 6 monthly checkups.Be careful when bathing in swimming pools,rivers