st./Update./2026
The./study./of./the./eye./and./it's./surrounding./structures,./proper./functions,./eye
./diseases./and./disorders,./and./all./aspects./of./vision../-
./correct./answer./Ophthamology
a./medical./doctor./specializing./in./the./prevention,./diagnosis,./and./medical./as
./well./as./surgical./treatment./of./vision./problems./and./eye./diseases./-
./correct./answer./ophthalmologist
independent./practitioner./who./completes./a./4-year./postgraduate,./doctoral-
level./course./in./optometry./after./typically./obtaining./a./bachelor's./degree../-
./correct./answer./Optometrist
independent./professional./usually./state./licensed./to./make./(dispense)./eyegl
asses./and./contact./lenses./according./to./prescriptions./supplied./by./an./ophtha
lmologist./or./optometrist../-./correct./answer./Optician
specializes./in./testing./visual./function,./particularly./in./infants./and./children,./
evaluating./eye./muscle./disorders,./and./evaluating./impairments./in./binocula
r./vision./such./as./double./vision../(bachelors./+./2./years)./-
./correct./answer./Orthoptist
,fabricates./and./fits./patients./with./prostheses./which./replace./a./surgically./rem
oved./eye./or./cover./an./unsightly./eye../-./correct./answer./Ocularist
photographs./the./eye./structures./for./diagnosis./and./documentation../-
./correct./answer./ophthalmic./photographer
any./individual./who./help./the./ophthalmologist./with./diagnostic./and./treatme
nt-oriented./procedures../-./correct./answer./ophthalmic./medical./assistant
-./COA./certified./ophthalmic./assistant
-./COT./certified./ophthalmic./technician
-./COMT./certified./ophthalmic./medical./technologist./-
./correct./answer./JCAHPO./3./levels./of./medical./assistant
ophthalmologists./who./confine./their./practice./to./diagnosis./and./treating./a./d
efined./area./of./the./eye./or./disease../-./correct./answer./subspecialist
clear,./round./membrane./at./the./front./of./the./globe../It./focuses./light./the./eye./re
ceives../-./correct./answer./Cornea
colored./circle./of./tissue../controls./the./amount./of./light./entering./the./eye./by./e
nlarging./or./reducing./the./size./of./the./opening./in./it's./center../-
./correct./answer./Iris
,opening./in./the./center./of./the./eye./-./correct./answer./pupil
(AKA./-./lens)./second./part./of./the./optical./focusing./system./of./the./eye../-
./correct./answer./crystalline./lens
(AKA./-./vitreous./body)./clear,./jelly-
like./substance../This./is./optically./transparent./so./as./light./focuses./through./th
e./vitreous./it./is./unaffected./by./the./substance../-./correct./answer./vitreous
light./sensitive./cells./on./the./back./of./the./eye./that./cover./the./image./to./electric.
/impulses./and./send./it./to./the./optic./nerve../-./correct./answer./Retina
Carry./the./electric./impulses./made./by./the./retina./to./the./brain../-
./correct./answer./Optic./Nerve
range./of./front-to-back./of./the./eye../Normal./is./between./23-
25./millimeters./in./length../-./correct./answer./Axial./length
average./is./545./micrometers./(0.5./millimeters)./-
./correct./answer./central./cornea./thickness./(CCT)
, an./ultrasound./test./that./measures./the./length./of./the./corneal./thickness./-
./correct./answer./pachymetry
60./diopters../cornea./=./42./(40)./diopters,./lens./=./18./(20)./diopters./-
./correct./answer./refracting./power./of./the./eye
The./tissues./and./structures./surrounding./the./eye../They./include./the./orbit,./ex
tra./ocular./muscles,./eyelids,./and./tear-producing./and./tear-
draining./lacrimal./apparatus../They./protect./the./globe../-
./correct./answer./Adnexa
the./pear-
shaped./bony./cavity./in./the./skull,./compromising./7./bones./that./house./the./glo
be,./extra./ocular./muscles,./blood./vessels,./and./the./nerves../-
./correct./answer./Orbit
fracture./in./the./floor./of./the./orbit./that./results./from./blunt-force./trauma./-
./correct./answer./Blowout./fracture
control./movement./of./the./globe../
- medial./rectus
./ ./
- lateral./rectus
./ ./
- superior./oblique
./ ./
- inferior./oblique
./ ./