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% Most of the following are not required for the majority
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% Document Info
\author{kkkklui}
\pdfinfo{
  /Title (biology-14-eyes.pdf)
  /Creator (Cheatography)
  /Author (kkkklui)
  /Subject (Biology 14 Eyes Cheat Sheet)
}

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\fancyhead[L]{
\noindent
\begin{multicols}{3}
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    {\parbox{\dimexpr\textwidth-2\fboxsep\relax}{\noindent
        \hspace*{-6pt}\includegraphics[width=5.8cm]{/web/www.cheatography.com/public/images/cheatography_logo.pdf}}
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\columnbreak
\begin{tabulary}{11cm}{L}
    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{Biology 14 Eyes Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{kkkklui} via \textcolor{DarkBackground}{\uline{cheatography.com/153917/cs/34754/}}}
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\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{LL}
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  \mymulticolumn{2}{p{5.377cm}}{\bf\textcolor{white}{Cheatographer}}  \\
  \vspace{-2pt}kkkklui \\
  \uline{cheatography.com/kkkklui} \\
  \end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Published 18th October, 2022.\\
   Updated 18th October, 2022.\\
   Page {\thepage} of \pageref{LastPage}.
\end{tabulary}
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  %\includegraphics[width=48px,height=48px]{dave.jpeg}
  Measure your website readability!\\
  www.readability-score.com
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\begin{document}
\raggedright
\raggedcolumns

% Set font size to small. Switch to any value
% from this page to resize cheat sheet text:
% www.emerson.emory.edu/services/latex/latex_169.html
\footnotesize % Small font.

\begin{multicols*}{4}

\begin{tabularx}{3.833cm}{p{0.6866 cm} x{2.7464 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{Human eye}}  \tn
% Row 0
\SetRowColor{LightBackground}
\seqsplit{Eyebrows} & prevent sweat from running into the eyes \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
Eyelash & traps dust and prevent it from running into the eyes \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
Eyelid & protect eyes from dirt and strong light \tn 
% Row Count 6 (+ 2)
% Row 3
\SetRowColor{white}
 & spread tears over eye surface when blinking \tn 
% Row Count 8 (+ 2)
% Row 4
\SetRowColor{LightBackground}
Tear gland & produces tears (sodium, chloride..) kills bacteria \tn 
% Row Count 10 (+ 2)
% Row 5
\SetRowColor{white}
Tear duct & drains tear into nasal cavity \tn 
% Row Count 12 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{p{0.44629 cm} x{2.98671 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{Process of seeing}}  \tn
% Row 0
\SetRowColor{LightBackground}
1 & light rays from object enters the eye \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
 & refracted and focused onto retina \tn 
% Row Count 3 (+ 1)
% Row 2
\SetRowColor{LightBackground}
by & cornea, aqueous humour, lens , vitreous humour \tn 
% Row Count 5 (+ 2)
% Row 3
\SetRowColor{white}
\seqsplit{cornea} & most of the refraction \tn 
% Row Count 7 (+ 2)
% Row 4
\SetRowColor{LightBackground}
lens & fine focusing \tn 
% Row Count 8 (+ 1)
% Row 5
\SetRowColor{white}
2 & real and inverted image formed on retina \tn 
% Row Count 10 (+ 2)
% Row 6
\SetRowColor{LightBackground}
3 & photoreceptors stimulated by light generate nerve impulse \tn 
% Row Count 12 (+ 2)
% Row 7
\SetRowColor{white}
 & nerve impulse travel along optic nerve to visual centre \tn 
% Row Count 14 (+ 2)
% Row 8
\SetRowColor{LightBackground}
4 & visual centre in cerebrum interpret nerve impulse as an upright image of object \tn 
% Row Count 17 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{x{0.85825 cm} x{2.57475 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{structure}}  \tn
% Row 0
\SetRowColor{LightBackground}
Orbit & socket in the skull \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
 & attached by 3 pairs of eye muscles \tn 
% Row Count 3 (+ 2)
% Row 2
\SetRowColor{LightBackground}
3 eye muscles & allow eyeball to rotate in different direction \tn 
% Row Count 5 (+ 2)
% Row 3
\SetRowColor{white}
\seqsplit{Conjunctiva} & transparent membrane \tn 
% Row Count 7 (+ 2)
% Row 4
\SetRowColor{LightBackground}
 & keeps front of eyes lubricated and moist \tn 
% Row Count 9 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{x{1.68217 cm} x{1.75083 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{Types of photoreceptors}}  \tn
% Row 0
\SetRowColor{LightBackground}
Rod cells & Cone cells \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
more numerous & less numerous \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
sensitive to low light intensity & sensitive to high light intensity \tn 
% Row Count 4 (+ 2)
% Row 3
\SetRowColor{white}
important for dim light vision & important for bright light vision \tn 
% Row Count 6 (+ 2)
% Row 4
\SetRowColor{LightBackground}
black and white vision & color vision (red, green, blue) \tn 
% Row Count 8 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{p{0.75526 cm} x{2.67774 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{DIstribution of photoreceptors on retina}}  \tn
% Row 0
\SetRowColor{LightBackground}
Rod cells & periphery of the retina \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
 & none at yellow spot and blind spot \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
Cone cells & concentrated at yellow spot \tn 
% Row Count 6 (+ 2)
% Row 3
\SetRowColor{white}
 & a few present on periphery of retina \tn 
% Row Count 8 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{x{1.09856 cm} x{2.33444 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{Functions}}  \tn
% Row 0
\SetRowColor{LightBackground}
Sclera & tough white coat \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
 & protects inner structure \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
 & maintain shape of eyeball \tn 
% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
 & surface for the attachment of eye muscle \tn 
% Row Count 5 (+ 2)
% Row 4
\SetRowColor{LightBackground}
Cornea & transparent layer of tissue \tn 
% Row Count 6 (+ 1)
% Row 5
\SetRowColor{white}
 & allows light to enter the eye \tn 
% Row Count 8 (+ 2)
% Row 6
\SetRowColor{LightBackground}
 & a curved surface to help refract and focus light on retina \tn 
% Row Count 11 (+ 3)
% Row 7
\SetRowColor{white}
 & no capillaries since it obtains nutrients from aqueous humour \tn 
% Row Count 14 (+ 3)
% Row 8
\SetRowColor{LightBackground}
Choroid & middle layer of eyeball \tn 
% Row Count 15 (+ 1)
% Row 9
\SetRowColor{white}
 & contains black pigment that absorbs light \tn 
% Row Count 17 (+ 2)
% Row 10
\SetRowColor{LightBackground}
 & pigment reduces reflection of light within the eye and helps form sharp images \tn 
% Row Count 20 (+ 3)
% Row 11
\SetRowColor{white}
 & rich in capillaries as it supplies nutrients to sclera and retina \tn 
% Row Count 23 (+ 3)
% Row 12
\SetRowColor{LightBackground}
Iris & continuous with the choroid \tn 
% Row Count 24 (+ 1)
% Row 13
\SetRowColor{white}
 & made up of muscles which controls the size of pupil to regulate the amount of light entering the eyes \tn 
% Row Count 28 (+ 4)
% Row 14
\SetRowColor{LightBackground}
 & contains pigment that determine the colour of iris \tn 
% Row Count 30 (+ 2)
\end{tabularx}
\par\addvspace{1.3em}

\vfill
\columnbreak
\begin{tabularx}{3.833cm}{x{1.09856 cm} x{2.33444 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{Functions (cont)}}  \tn
% Row 15
\SetRowColor{LightBackground}
Pupil & an opening at centre of the iris \tn 
% Row Count 2 (+ 2)
% Row 16
\SetRowColor{white}
 & allows light to enter the eyes \tn 
% Row Count 4 (+ 2)
% Row 17
\SetRowColor{LightBackground}
 & size is controlled by iris \tn 
% Row Count 5 (+ 1)
% Row 18
\SetRowColor{white}
Retina & innermost layer of eyeball \tn 
% Row Count 6 (+ 1)
% Row 19
\SetRowColor{LightBackground}
 & contains many photoreceptors and nerve fibres \tn 
% Row Count 8 (+ 2)
% Row 20
\SetRowColor{white}
 & photoreceptors : rod or cone cells \tn 
% Row Count 10 (+ 2)
% Row 21
\SetRowColor{LightBackground}
Optic nerves & nerve fibres in retina grouped \tn 
% Row Count 12 (+ 2)
% Row 22
\SetRowColor{white}
 & transmits nerve impulses from photoreceptors to cerebrum of brain \tn 
% Row Count 15 (+ 3)
% Row 23
\SetRowColor{LightBackground}
Yellow spot & high density of cone cells \tn 
% Row Count 16 (+ 1)
% Row 24
\SetRowColor{white}
 & no rod cells \tn 
% Row Count 17 (+ 1)
% Row 25
\SetRowColor{LightBackground}
Blind spot & no photoreceptors \tn 
% Row Count 18 (+ 1)
% Row 26
\SetRowColor{white}
Lens & transparent , elastic , biconvex \tn 
% Row Count 20 (+ 2)
% Row 27
\SetRowColor{LightBackground}
 & refracts and focuses light on retina \tn 
% Row Count 22 (+ 2)
% Row 28
\SetRowColor{white}
 & thickness adjusted by ciliary body \tn 
% Row Count 24 (+ 2)
% Row 29
\SetRowColor{LightBackground}
 & living cells with no nuclei \tn 
% Row Count 25 (+ 1)
% Row 30
\SetRowColor{white}
 & no capillaries as it obtains nutrients from aqueous humour \tn 
% Row Count 28 (+ 3)
% Row 31
\SetRowColor{LightBackground}
Suspensory ligament & connected to ciliary body \tn 
% Row Count 30 (+ 2)
\end{tabularx}
\par\addvspace{1.3em}

\vfill
\columnbreak
\begin{tabularx}{3.833cm}{x{1.09856 cm} x{2.33444 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{Functions (cont)}}  \tn
% Row 32
\SetRowColor{LightBackground}
Ciliary body & contains ciliary muscles \tn 
% Row Count 1 (+ 1)
% Row 33
\SetRowColor{white}
 & controls tension of suspeonsory ligaments \tn 
% Row Count 3 (+ 2)
% Row 34
\SetRowColor{LightBackground}
 & controls thickness of lens \tn 
% Row Count 4 (+ 1)
% Row 35
\SetRowColor{white}
Aqueous humour & watery fluid produced by ciliary body between cornea and lens \tn 
% Row Count 7 (+ 3)
% Row 36
\SetRowColor{LightBackground}
 & supplies nutrients and o2 to cornea and lens by diffusion \tn 
% Row Count 10 (+ 3)
% Row 37
\SetRowColor{white}
Vitreous humour & jelly like fluid between lens and retina \tn 
% Row Count 12 (+ 2)
% Row 38
\SetRowColor{LightBackground}
Both & refracts lights on retina \tn 
% Row Count 13 (+ 1)
% Row 39
\SetRowColor{white}
 & maintain shape of eyeball \tn 
% Row Count 14 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{x{1.27021 cm} x{2.16279 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{Drawing ray diagrams}}  \tn
% Row 0
\SetRowColor{LightBackground}
Light rays (distant) & parallel \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
Light rays (near) & come from the same point of object \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
Reminders & add arrows \tn 
% Row Count 5 (+ 1)
% Row 3
\SetRowColor{white}
 & dotted lines behind retina \tn 
% Row Count 7 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{x{1.30454 cm} x{2.12846 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{Seeing in dim light}}  \tn
% Row 0
\SetRowColor{LightBackground}
Circular muscles of iris & relaxes \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
Radial muscles & contracts \tn 
% Row Count 3 (+ 1)
% Row 2
\SetRowColor{LightBackground}
Pupil & dilates \tn 
% Row Count 4 (+ 1)
% Row 3
\SetRowColor{white}
Result & more light enters eyes \tn 
% Row Count 5 (+ 1)
% Row 4
\SetRowColor{LightBackground}
Importance & allow photoreceptors to be stimulated so a clear image forms \tn 
% Row Count 8 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{x{1.30454 cm} x{2.12846 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{Seeing in bright light}}  \tn
% Row 0
\SetRowColor{LightBackground}
Circular muscles of iris & contracts \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
Radial muscles & relaxes \tn 
% Row Count 3 (+ 1)
% Row 2
\SetRowColor{LightBackground}
Pupil & constricts \tn 
% Row Count 4 (+ 1)
% Row 3
\SetRowColor{white}
Result & less light to enter eye \tn 
% Row Count 5 (+ 1)
% Row 4
\SetRowColor{LightBackground}
Importance & prevent photoreceptors from being damaged by bright light \tn 
% Row Count 8 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{x{1.13289 cm} x{2.30011 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{Near objects}}  \tn
% Row 0
\SetRowColor{LightBackground}
Ciliary muscles & contract \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
Tension & reduced \tn 
% Row Count 3 (+ 1)
% Row 2
\SetRowColor{LightBackground}
Suspensory ligaments & slackened \tn 
% Row Count 5 (+ 2)
% Row 3
\SetRowColor{white}
Lens & thicker (more convex) \tn 
% Row Count 6 (+ 1)
% Row 4
\SetRowColor{LightBackground}
 & refracts more light \tn 
% Row Count 7 (+ 1)
% Row 5
\SetRowColor{white}
Eye strains & ciliary muscles contracting for a long time \tn 
% Row Count 9 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{x{1.68217 cm} x{1.75083 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{Distant objects}}  \tn
% Row 0
\SetRowColor{LightBackground}
Ciliary muscles & relaxes \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
Tension & increases \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
Suspensory ligaments & tightened \tn 
% Row Count 4 (+ 2)
% Row 3
\SetRowColor{white}
Lens & thinner (less convex) \tn 
% Row Count 6 (+ 2)
% Row 4
\SetRowColor{LightBackground}
 & refracts light less \tn 
% Row Count 7 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{x{1.0299 cm} x{2.4031 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{Short sighted}}  \tn
% Row 0
\SetRowColor{LightBackground}
Vision problem & cannot see distant object clearly \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
Cause & lens too thick \tn 
% Row Count 3 (+ 1)
% Row 2
\SetRowColor{LightBackground}
 & eyeball too long \tn 
% Row Count 4 (+ 1)
% Row 3
\SetRowColor{white}
Image & formed in front of retina \tn 
% Row Count 5 (+ 1)
% Row 4
\SetRowColor{LightBackground}
Correction & concave lenses (diverges light) \tn 
% Row Count 7 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{x{1.06423 cm} x{2.36877 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{Long sighted}}  \tn
% Row 0
\SetRowColor{LightBackground}
Vision problem & cannot see near objects clearly \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
Cause & lens too thin \tn 
% Row Count 3 (+ 1)
% Row 2
\SetRowColor{LightBackground}
 & eyeball too short \tn 
% Row Count 4 (+ 1)
% Row 3
\SetRowColor{white}
Image & formed behind the retina \tn 
% Row Count 5 (+ 1)
% Row 4
\SetRowColor{LightBackground}
Correction & convex lens (converge light) \tn 
% Row Count 7 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{p{0.75526 cm} x{2.67774 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{Color blindness}}  \tn
% Row 0
\SetRowColor{LightBackground}
Problem & cannot distinguish colors \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
Cause & deficiency of one or more cone cells \tn 
% Row Count 3 (+ 2)
% Row 2
\SetRowColor{LightBackground}
\seqsplit{Correction} & no cure \tn 
% Row Count 5 (+ 2)
% Row 3
\SetRowColor{white}
 & wear lenses \tn 
% Row Count 6 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}


% That's all folks
\end{multicols*}

\end{document}