Spider veins on sclera - the realm of ophthalmology ONLY
Do not let anyone but an ophthalmologist to diagnose or treat eye problems. This is a different issue than spider veins altogether. You don't want to lose your eyesight.
If you have noticed the veins on your eye getting larger, you should seek a consultation with an ophthalmologist. There are not any recommended treatments for these types of veins and I would recommend you not do anything prior to being evaluated by an ophthalmologist.