How do I tell if I have dry eyes or allergic conjunctivitis?

Dry eye vs allergy. Dry eye typically feels scratchy, irritated, like something is in your eye, light sensitive. Allergies in the eye typically causes itchiness in the eye.
Examination. Both conditions can cause the eyes to feel irritated. Allergies frequently have itching. Both can cause a goopy tear. Dry eye disease can make allergic conjunctivitis worse. They look very different and distinct on exam. Get an eye exam to get the correct diagnosis-- treatments are very different.

Related Questions

Which allergy pills are better for someone with allergic conjunctivitis and dry eyes?

? Any of the 2nd generation less sedating antihistamines would do, can't tell which one would work in your case, but if it works, you need to take it regularly, read the labels carefully. You ultimately need to see your doctor / ophthalmologist as you mentioned dryness and redness too which can be something else other than just allergies, meanwhile use lubricant eye drops/artificial tears.

Allergic conjunctivitis? - itchy, dry eyes, alaway doesn't help. Cloudy vision. And swelling of conjunctiva. Ragweed. Hypersensitive for allergy shots.

See allergist. There are several antihistamine eye drops you can try including one called zaditor (ketotifen) sold otc. However you may need to see an allergist if the problem continues. If you mean that you cannot tolerate allergy shots, I would urge you to get a 2nd opinion since this is quite rare.
Allergic eye disease. See an eye doctor to consider prescription meds for your allergic conjunctivitis.
Mgt. If your vision has changed, I would advise seeing your Opthalmologist immediately. There may be another cause for the vision change.

Very itchy, dry, sore eyes; allergic conjunctivitis or something viral?

Could be either. Try cool compresses, artifical tears, and an allergy medicine such as zyrtec or allegra (fexofenadine). If it's viral, it will clear up on its own in a few days. If it doesn't, you should see your doctor. Also see your doctor if you wake up with goop in your eyelashes making them feel like they are glued shut. This can indicate a bacterial infection.

Allergic conjunctivitis--do I need to throw out all my eye makeup : (?

Allergic Conjunctivi. If the cause of your allergic conjunctivitis is makeup than you have to discard what you were using and replace it with different based make up. You will have to check the ingredients in the one you were using. Yes replace it.