When a patient has one eye for distance and one eye for near, they may notice their vision is not as sharp at certain times or in certain situations as it would be if both eyes were working together. Monovision patients frequently notice distance blur or light scattering from the reading eye under conditions requiring the best distance vision, such as driving at night or driving in the rain. They may also notice a slight reduction in depth perception during sport activities such as golf or tennis. Finally some patients they may notice difficulty with prolonged reading or with very fine visual tasks such as needlepoint and sewing.