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# Title: Lexicon Technicum: Or, An Universal English Dictionary Of Arts And Sciences (shelfmarks Leibn. Marg. 71; ZEN Leibn. Marg. 71)
# Folio - , page id 806933011:0900
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nud poine che Lmasc ol ihe Pvinc P, on ihe Furdot
c esCac c
it ec dirergins Rars B u, b X, (Fi8. 1.
fusedlr, For ds Paleu Or the Space r+; Wvhereas
to cause distinct Vann, l Mould onlr be painred
chac Ao trom che Poinc b, ineer che Convex- gla(5
x, aud are therebr made to converge, a5 vi, X h
and (0 fall on the Fre, and there paltine chroueh
the Ceystalline s h, are made to Converse Yet
more, 25i e, ke: Elere cher crols in the Poince
betore cher reachthe RetinarF, and consequent.
Iy do paint chercon the Image of the Poine b con-
The Pond, Wnich is the Verrex of the Opricke
Angle, is varionsy assiened by rarious AuctOrS;
Come placins ic in che Cenrre of the Fye; Others
in the Verrex oF the Crystalline; Others in the
Verrex of the outward Coat or Cornea of thefye;
bur tis a Matter OF no great consequence Wherever
ve place ic; for accordins ro the bignels of this
Faule ot cheir Fyes
Whoare called Myopes
Purblind, Or Short
Sichted. For in chem
che Crrstalline is E00
Conrex, (a5 in F18. 3
bochche Convex- glass
and Cerstalline jornd
rogether, make tOC
Greac a C onvezitr) u
nitins che Rarsbetore
ther arrive ac the RC.
cina. And cheretore
chey are help d be
Concave slasses, wrhich
catre oA trom che rOO
Sreat Conrexiey ot
cheir Crystalline, some
parr ot ies Retractire
Porver: Or rathet
these Concares make
the Rays diverse 10
thac cheir Cerstalline
Mall be sufticient onty
to brins chem again
together, (0 thac chey
be noc touched, ril
rheyarrire actheFund
oE the Fye.
Myopes are allo hel.
ped by holdine che
Object verrnear; Lon
thenche Rars thac Fal
on cheir Fye trom ans
single Point, de more
diverge, chan when the
Eye is Farchex Fromthe
Point, and consequent.
Iy cheir t00 Convex
Crrstalline does bur
sussice to brins chem
rogerher on che Re.
tina.
B. Onthe ContTAEY
the Fres oF OId Mer
have cheir Crystalline
Angle a oc the Image on the Fund of che EsC is 100 AaF, (a5 Fis. 4.
bigger or lels.
and cannor correctche
divergence ofcheRays
e perccive the Rays thac ROW FrOm the Bu, B k, EO make them meet on the KCMaTL, buL
Point b, do proceed tothe Lre Divergins, 25 b 5,
Bo, bh: And if che Object a c vere intinicelr di-
stant from ehe Fre, or lodistaneFrom chefire, thac
the Breadch oF the Pupili le ivere insensible in com-
Parison co chis Vistance; then RayS b8, b 0, bh,
berond che Ere aEC. WheretOre For theirhelp ris
requisite cher add theadrentirious Conrexier oF 2
OlaIs; thac boch ic and che Cerstalline toserher,
mar be Cufficient co unire the Rays jus aE che Re-
tina: And From hence ic appears, charspectacles help
rould procced a5 ic vere parallel, and (0 Fall on OId Men, noc by magnitrins an Obiect, but by
the Eyc: In Boch erhich cales, by means ot thc makeinu ies Axpearance dictinct; For OId NIen CAn.
Retractions ot ihe Fye, cher ace brovehi ioseihec, noc cend he lacgek Pcinc Wichone Spectactes, and
on a correspondent Poinc on che Retina.
And chis is the