You were prescribed tobradex eye drops a year ago following injury
, but you are not suppose to use tobradex for long time as tobradex contains dexamethsone, steroid
eye drops, which is known to cause steroid induced glaucoma
and increased incidence of infections of ocular surface.
Since you are having symptoms like redness
, watering and pain in the eyes, probably you are sufferring from chronic inflammation or allergic condition of the eye. All these conditions like allergic diseases of the eye and chronic inflammations do improve with the use of steroid eye drops, but using these eye drops for long time is not advised.
You need to undergo evaluation and examination of the eyes by eye doctor to find out the nature of the disease and treatment accordingly.