Thanks for writing to HCM.
Since you haven't mentioned your age, if you are above 40yrs,
-The most common cause is a Cataract
formation. With your above symptoms it should be more of a central opacity leading to photophobia( sensitivity to bright light).
- if your eyes are red, with watering and irritation and discharge or if you had any accidental injury
to your eyes, then it could be an inflammation causing photophobia.
- or simply it could be a refractive error
In either way, the best option is to consult an eye doctor for a direct examination to find the cause. The above mentioned problems are treatable so the earlier the better .
Hope this answers your question.
Take care. Do let us know after an examination.