\documentclass[10pt,a4paper]{article}

% Packages
\usepackage{fancyhdr}           % For header and footer
\usepackage{multicol}           % Allows multicols in tables
\usepackage{tabularx}           % Intelligent column widths
\usepackage{tabulary}           % Used in header and footer
\usepackage{hhline}             % Border under tables
\usepackage{graphicx}           % For images
\usepackage{xcolor}             % For hex colours
%\usepackage[utf8x]{inputenc}    % For unicode character support
\usepackage[T1]{fontenc}        % Without this we get weird character replacements
\usepackage{colortbl}           % For coloured tables
\usepackage{setspace}           % For line height
\usepackage{lastpage}           % Needed for total page number
\usepackage{seqsplit}           % Splits long words.
%\usepackage{opensans}          % Can't make this work so far. Shame. Would be lovely.
\usepackage[normalem]{ulem}     % For underlining links
% Most of the following are not required for the majority
% of cheat sheets but are needed for some symbol support.
\usepackage{amsmath}            % Symbols
\usepackage{MnSymbol}           % Symbols
\usepackage{wasysym}            % Symbols
%\usepackage[english,german,french,spanish,italian]{babel}              % Languages

% Document Info
\author{rjjjia}
\pdfinfo{
  /Title (eye.pdf)
  /Creator (Cheatography)
  /Author (rjjjia)
  /Subject (Eye Cheat Sheet)
}

% Lengths and widths
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\addtolength{\hoffset}{-3cm}
\addtolength{\voffset}{-2cm}
\setlength{\tabcolsep}{0.2cm} % Space between columns
\setlength{\headsep}{-12pt} % Reduce space between header and content
\setlength{\headheight}{85pt} % If less, LaTeX automatically increases it
\renewcommand{\footrulewidth}{0pt} % Remove footer line
\renewcommand{\headrulewidth}{0pt} % Remove header line
\renewcommand{\seqinsert}{\ifmmode\allowbreak\else\-\fi} % Hyphens in seqsplit
% This two commands together give roughly
% the right line height in the tables
\renewcommand{\arraystretch}{1.3}
\onehalfspacing

% Commands
\newcommand{\SetRowColor}[1]{\noalign{\gdef\RowColorName{#1}}\rowcolor{\RowColorName}} % Shortcut for row colour
\newcommand{\mymulticolumn}[3]{\multicolumn{#1}{>{\columncolor{\RowColorName}}#2}{#3}} % For coloured multi-cols
\newcolumntype{x}[1]{>{\raggedright}p{#1}} % New column types for ragged-right paragraph columns
\newcommand{\tn}{\tabularnewline} % Required as custom column type in use

% Font and Colours
\definecolor{HeadBackground}{HTML}{333333}
\definecolor{FootBackground}{HTML}{666666}
\definecolor{TextColor}{HTML}{333333}
\definecolor{DarkBackground}{HTML}{A4E0A4}
\definecolor{LightBackground}{HTML}{F3FBF3}
\renewcommand{\familydefault}{\sfdefault}
\color{TextColor}

% Header and Footer
\pagestyle{fancy}
\fancyhead{} % Set header to blank
\fancyfoot{} % Set footer to blank
\fancyhead[L]{
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{C}
    \SetRowColor{DarkBackground}
    \vspace{-7pt}
    {\parbox{\dimexpr\textwidth-2\fboxsep\relax}{\noindent
        \hspace*{-6pt}\includegraphics[width=5.8cm]{/web/www.cheatography.com/public/images/cheatography_logo.pdf}}
    }
\end{tabulary}
\columnbreak
\begin{tabulary}{11cm}{L}
    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{Eye Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{rjjjia} via \textcolor{DarkBackground}{\uline{cheatography.com/57957/cs/15337/}}}
\end{tabulary}
\end{multicols}}

\fancyfoot[L]{ \footnotesize
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{LL}
  \SetRowColor{FootBackground}
  \mymulticolumn{2}{p{5.377cm}}{\bf\textcolor{white}{Cheatographer}}  \\
  \vspace{-2pt}rjjjia \\
  \uline{cheatography.com/rjjjia} \\
  \end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Published 1st April, 2018.\\
   Updated 1st April, 2018.\\
   Page {\thepage} of \pageref{LastPage}.
\end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Sponsor}}  \\
  \SetRowColor{white}
  \vspace{-5pt}
  %\includegraphics[width=48px,height=48px]{dave.jpeg}
  Measure your website readability!\\
  www.readability-score.com
\end{tabulary}
\end{multicols}}




\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*}{3}

\begin{tabularx}{5.377cm}{x{1.14471 cm} x{3.83229 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Parts of the eye}}  \tn
% Row 0
\SetRowColor{LightBackground}
Iris & Controls the amount of light entering the eye \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
Pupil & A hole in the centre of the iris where light enters \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
Cornea & Transparent layer, refracts light rays into pupil \tn 
% Row Count 6 (+ 2)
% Row 3
\SetRowColor{white}
Humour & Refracts light rays (aqueous/vitreous) \tn 
% Row Count 8 (+ 2)
% Row 4
\SetRowColor{LightBackground}
Lens & Transparent, circular, biconvex structure, elastic, change shape to refract and focus light onto the retina \tn 
% Row Count 12 (+ 4)
% Row 5
\SetRowColor{white}
Ciliary body & Contains ciliary muscles that contract/relax to control the curvature of the lens \tn 
% Row Count 15 (+ 3)
% Row 6
\SetRowColor{LightBackground}
Choroid & Pigmented black to prevent internal reflection of light, contains blood vessels to bring nutrients/oxygen and remove metabolic wastes \tn 
% Row Count 20 (+ 5)
% Row 7
\SetRowColor{white}
Retina & Cones; colours in bright light. Rods; black and white in the dark \tn 
% Row Count 23 (+ 3)
% Row 8
\SetRowColor{LightBackground}
Fovea & Largest concentration of cones, where images are usually focused \tn 
% Row Count 26 (+ 3)
% Row 9
\SetRowColor{white}
Blind spot & Devoid of photo-receptors and is insensitive to light \tn 
% Row Count 28 (+ 2)
% Row 10
\SetRowColor{LightBackground}
Eyelids & Protects eye from physical damage, prevents excessive light from damaging tissues inside the eye \tn 
% Row Count 32 (+ 4)
\end{tabularx}
\par\addvspace{1.3em}

\vfill
\columnbreak
\begin{tabularx}{5.377cm}{x{1.14471 cm} x{3.83229 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Parts of the eye (cont)}}  \tn
% Row 11
\SetRowColor{LightBackground}
Sclera & Tough, white outer covering, protects the eyeball from physical damage, covered by conjuctiva \tn 
% Row Count 4 (+ 4)
% Row 12
\SetRowColor{white}
Tear glands & Secretes tears to wash away dust particles, lubricate the eye, keep conjuctiva and cornea moist \tn 
% Row Count 8 (+ 4)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Structure}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{p{5.377cm}}{\vspace{1px}\centerline{\includegraphics[width=5.1cm]{/web/www.cheatography.com/public/uploads/rjjjia_1522584510_eye.png}}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Side view}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Pupil reflex}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{Reflex action is an {\bf{involuntary response}} to a specific stimulus, without conscious control. It involves the brain as the reflex centre.  \newline % Row Count 3 (+ 3)
{\bf{Pathway}}: Stimulus -\textgreater{} photo-receptors in retina -\textgreater{} sensory neurone in optic nerve -\textgreater{} brain -\textgreater{} motor neurone -\textgreater{} effector% Row Count 6 (+ 3)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Lens shape}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{p{5.377cm}}{\vspace{1px}\centerline{\includegraphics[width=5.1cm]{/web/www.cheatography.com/public/uploads/rjjjia_1522585777_accomodation.jpg}}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Distance}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{1 Focusing on a {\emph{distant/near}} object  \newline % Row Count 1 (+ 1)
2 Ciliary muscles {\emph{relax/contract}} \newline % Row Count 2 (+ 1)
3 Suspensory ligaments become {\emph{taut/slacken}} \newline % Row Count 3 (+ 1)
4 {\emph{Pulling/relaxing}} on the edge of the lens  \newline % Row Count 4 (+ 1)
5 Lens become {\emph{less/more}} convex, {\emph{increasing/decreasing}} focal length \newline % Row Count 6 (+ 2)
6 Light rays from the object are sharply focused on the retina  \newline % Row Count 8 (+ 2)
7 Photo-receptors are stimulated \newline % Row Count 9 (+ 1)
8 Nerve impulses produced are transmitted by the optic nerve to the brain, which then interprets the impulses and the person sees the object. \newline % Row Count 12 (+ 3)
Distant; ciliary relax, lens becomes thinner \newline % Row Count 13 (+ 1)
Near; ciliary contract, lens becomes thicker% Row Count 14 (+ 1)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Iris muscles}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{p{5.377cm}}{\vspace{1px}\centerline{\includegraphics[width=5.1cm]{/web/www.cheatography.com/public/uploads/rjjjia_1522585997_light.jpg}}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Brightness}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{1 Change in light intensity \newline % Row Count 1 (+ 1)
2 {\bf{Stimulus}} is detected by {\bf{photo-receptors}} located in the retina \newline % Row Count 3 (+ 2)
3 An electrical impulse is generated, transmitted by sensory neurones in the optic nerve to the brain \newline % Row Count 6 (+ 3)
4 At the brain, the impulse is transmitted across a synapse to the relay neurone, then across another synapse to the motor neurone \newline % Row Count 9 (+ 3)
5 Motor neurone transmits the impulse to the {\bf{circular and radial}} muscles of the iris \newline % Row Count 11 (+ 2)
6 Circular muscles {\emph{contract/relax}}, while radial muscles {\emph{relax/contract}}. This causes the pupil to {\emph{constrict/dilate}}, thereby {\emph{reducing/increasing}} the amount of light entering the eye \newline % Row Count 15 (+ 4)
Bright: Circular contract, radial relax, pupil constrict \newline % Row Count 17 (+ 2)
Dim: Circular relax, radial contract, pupil dilate% Row Count 18 (+ 1)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}


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

\end{document}