Krefman, R A <br/><br/>
Working distance comparison of plus lenses and reading telescopes.  [electronic resource] 

 -  American journal of optometry and physiological optics  Nov 1980 
 - 835-8 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>0093-7002 
<br/><br/><label>Standard No.: </label>10.1097/00006324-198011000-00009  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Eyeglasses--standards<br/>Humans<br/>Lenses--standards<br/>Mathematics<br/>Optics and Photonics<br/>Refractive Errors--therapy