Birch, David G <br/><br/>
A double-blind placebo-controlled evaluation of the acute effects of sildenafil citrate (Viagra) on visual function in subjects with early-stage age-related macular degeneration.  [electronic resource] 

 -  American journal of ophthalmology  May 2002 
 - 665-72 p.  digital 
<br/><br/> Publication Type: Clinical Trial; Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't 
<br/><br/><label>ISSN: </label>0002-9394 
<br/><br/><label>Standard No.: </label>10.1016/s0002-9394(02)01338-7  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>3',5'-Cyclic-GMP Phosphodiesterases--antagonists & inhibitors<br/>Aged<br/>Aged, 80 and over<br/>Color Perception--drug effects<br/>Color Perception Tests<br/>Cross-Over Studies<br/>Double-Blind Method<br/>Drug Evaluation<br/>Humans<br/>Macular Degeneration--complications<br/>Male<br/>Middle Aged<br/>Phosphodiesterase Inhibitors--administration & dosage<br/>Piperazines--administration & dosage<br/>Prospective Studies<br/>Purines<br/>Safety<br/>Sildenafil Citrate<br/>Sulfones<br/>Visual Acuity--drug effects<br/>Visual Field Tests<br/>Visual Fields--drug effects