Provided herein are a class of purine nucleoside compounds, particularly substituted adenosine compounds, such as benzyloxy cyclopentyladenosine (BCPA) compounds, as well as methods of using these compounds as selective A1 adenosine receptor agonists, particularly for reducing and/or controlling elevated or abnormally fluctuating intraocular pressure (IOP) in the treatment of glaucoma or ocular hypertension (OHT).
