Figure 1. The pH values of the commonly available eye drops in eye clinics and emergency departments are shown here with the pH meter.

Saline shown in the figure is used as a control. The eye drops from right to left starting from the top row are as follows: Prednisolone eye drops 0.1%, Prednisolone 0.5% eye drops, Dexamethasone sodium phosphate 0.1%, Saline (control), Tropicamide 1%, Atropine 1%, combination drops of proxymethocaine and fluoresceine, fluorescein 1% eye drops, carbomer artificial tears, phenylephrine 2.5%, proxymethocaine 2.5%, cyclopentolate 1%, oxybuprocaine 0.4%, chloramphenicol 0.5% eye drops and carmellose sodium 0.5% eye lubricant. All these drops apart from saline have non-neutral pH.