The sun., 1894-12-30
PHoroGR4PHING THE INyER ErE.
The Difficulties In tho Way aad the ERorss
orOeuiists to Overcome Them.

Some OF the oculists Interested in the effort 70
photograph the interior OF the human eye are
looking TO chemistry for the next relief from
the adverse conditions with which they are
confronted The efforts to photograph In colors
are likely IL successful TO aid materially in the
work OF securing picture OF the interior OF the
eye by producing Photographic plate sensitive
to the red rays of light Apparently the latest
paper written on the general subject OF photo
graphing the interior OF the human eye is one By
Dr. Lucien Howe OF Buffalo. y. Y. II Is published
in the record OF the fourteenth session OF the
OphtAalmOlOgical Society OF the United King
dom, which ended in July.
Dr. Howe calls attention TO the ease with
which, theoretically, such photograph can b
made, which has led 70 the making OF many
attempts TO secure one. But the attempts, from
ful Ia showing the dificultes In the way OF their
accomp! ishmeut DIR. Howe mentions one by
Of the interior II cats eye, but il merely shows
an Indefinite outline Of some objects At the base
OF the globe OF the eye. Even the outline Of the
optic Ieryc cannot be distinguished. some
Ines appear radIating from the centre, and give
Howe SAYS it would hardly be recognized as Z
photograph OF the interior OF the eye unless one
ffEcse lines he sscribes 10 the cornesl reaeS' A.
Although for fifteen years little OF note was
doue along this line, many ATTEMPTS have been
made in ~. last tive years. In 1880 DIR. A. Eu-
gene rick Of Zurich got picture Of the fundus
or base Uf the eye Uf an albluO rabbit but al
though two or three vessels can be seen. there In
no d.-lluct outline OF the optic nerve. In 1891
nT. usHa.d tIcTlUff. 20 obviAts the corneal re-
hex. covered tha. part OF the eye, and, although
lie did away with the reheX, the vessels were
hardly more apparent than in DR.. Fick's picture
nr. Ger.or pasture was Of . human eye blind
from airUphy-
Ii- til Use of oTthochromAtic or isochromAtio
plates. sac. a. are made for the efforts TO take
photographs Ia cp!0rs and 10 be sensitive 70 red
l-At ray :, Dr. Howe took several pictures Of
ar artificial eye. and the outlines OF the vessels
zero l. al - = when a
with he UphtLa4mOsCope. Hut IN Photograph
ie tOnA, a.-p WITH al ispchrOmatC plate. Of 4
normal human eye with the pupil widely
a atsa ua.y the outline Of the disk could u
trared to a considerable distance. This photo
graph, althouEh b imperfect ls called the best oRS
80 IAr Proc rCed.
The elam;uer's eye At the opt hthalmoseops bSIns
merely q camera, !t IS theoretically one OF the
ra-Iesi things imaginable 20 replace Il with pho
to-TapLlr camera and let the pictures so clear
lI prod 4r ei A.. the examiner FetlnA be impresssd
o. t.e D. HtFETAIhi" plate. But in experiment.
"a" Tr-...', seemingly natural and inevitable.
Laes Gur com" about Tie liShl rejected from
tie ign.u, ocg.t or base OF the globe Of the eye,
j. red, aat 20 Ia, Little or no effect On the aim
ri TIE Eh1tusraI hie plate, Just as the red light
~ IA ihs LEoi,oSrabhers daIk room dos h9t
would De- r.! Hrd by white light 81 Dr Hose
..Hs-, rv.vI IU-t come from the chemist
T e. r.AG-:ar l.regs nave been making plata
. .rgrT LAT -"p-.'lse o. rcd rays. aud Or. HoWS
.'-,a- o. them iHr The gext AdsaLre la the e1-
lt- "-----i- ."- .'5' o u rcr ys-sry tLAt the
I.a'.- .sy-' ''- a rt7! lg.y RAPID As dr4xinga
4. u..F t..lu .L.al- a. tHs rr~ ATE Iure,labfa
ELougraphs are much % H. desired. anA Dr.
sssIlsa e sIAsS sARsEaAsHsss4