Seeing my eyelashes in vision.why?only when looking @ white background on ipad.(ex: health tap) also tv screen.been 2 wks. eye exam in oct; allergies

This is normal: The reason you can see your eyelashes is that the light backgrounds you describe with your field of vision sets up the contrast that allows you to see them since they are dark in contrast to this background. With your youth your field of vision is excellent and allows you to see them.

Maybe:: It might not be your eyelashes If you physically raise your upper lids when you see them and they disappear, then you indeed have long lashes. They can be trimmed if needed. If they persist, then you are perceiving shadows from material in your eye that casts shadows on the retina when exposed to a bight light--health tap. This should be evaluated by an ophthalmologist

Long lashes: If you are sure you are not having flashes of light, floaters, or any change/decreased vision in either eye, then seeing eyelashes as part of your vision on a white background is usually normal: you likely have long lashes. Try to look beyond your lashes to avoid frustration if bothering you.