1 8 2 Cafe of a Perfon becoming fhort-fightedy ^c. 



vitate and prefs in all direftions with more force 

 as there is more of it elevated above the furfacc 

 of the fupporting water. 



Case of a Person becoming short-sighted in 

 ADVANCED Age J by Thomas Henry, F.R.S. 



READ NOVEMBER 29, 1 786. 



I REMEMBER it was, fome years fince, men- 

 tioned in this Society, that a method had 

 been recommended, but where or by whom I 

 do not recoUecl, of preventing the neceflity of 

 ufing fpeclacles, in advanced age. It confifted 

 in the pradlice of reading a very fmall print by 

 the light of a fmall candle. By this means, the 

 humours of the eye being protruded, the cryf- 

 talline lens was fuppofed to be hindered from 

 lofing its convex form, and affuming that flat- 

 nefs, which it acquires in old perfons. 



I lately met with a Gentleman, who, contrary 

 to what generally happens to men as they ad- 

 vance in life, was, at the age of fifty, become 

 fhort-fighted ; whereas, when younger, his eyes 

 had not that fault ; and who inftead of being 

 obliged to ufe convex glaffes, had found it 



neceflary 



