# The Effect of 3D TVs on Eye Movement and Motor Performance
## 3 Results
### Eye Movement
#### 3.1.3 Number of Fixations  
The main effect of the index of difficulty (F\({}_{5,55}\) = 15.022, \(p\)-value = 0.000) was significant for the number of fixations (Table 5). Post-hoc analysis with a Tukey HSD test revealed that there was a significant different when index of difficulty varied from low to high. The Tukey HSD test divided the index of difficulty levels into three groups as shown in Table 5. Similarly, the interaction of the environment and the index of difficulty was significantly different for number of fixations (F\({}_{5,55}\) = 3.171, \(p\)-value = 0.014). We did not find a significant difference in number of fixations for the environment (F\({}_{1,11}\) = 1.726, \(p\)-value = 0.216), depth (F\({}_{2,22}\) = 0.064, \(p\)-value = 0.938), interaction of the environment and depth (F\({}_{2,22}\) = 1.055, \(p\)-value = 0.365), interaction of depth and the index of difficulty (F\({}_{10,110}\) = 0.973, \(p\)-value = 0.471), and interaction of the environment, depth, and the index of difficulty (F\({}_{10,110}\) = 0.660, \(p\)-value = 0.759).  
\begin{table}
\begin{tabular}{c c c c c c} \hline \multicolumn{6}{c}{**Index of Eye Performance**} \\ \hline  & **Level** & **Mean (bits/s)** & **Group \({}^{\mathbf{a}}\)** & **SD** & **F\({}_{\mathbf{n,m}}\)** & \(p\)**-Value** \\ \hline \multirow{3}{*}{Environment} & 2D Screen Display & 10.712 & A & 6.999 & \multirow{3}{*}{F\({}_{1,11}\) = 5.249} & \multirow{3}{*}{\(p\) = 0.043} \\  & 3D Stereoscopic Display & 8.360 & B & 4.824 & \\ \hline \multirow{3}{*}{Depth} & 210 cm & 10.078 & A & 6.836 & \multirow{3}{*}{F\({}_{2,22}\) = 1.317} & \multirow{3}{*}{\(p\) = 0.288} \\  & 190 cm & 9.665 & A & 6.361 & \\ \cline{1-1}  & 140 cm & 8.728 & A & 5.153 & \\ \hline Environment \({}^{\star}\) Depth & & & & & \\ \hline \end{tabular}
\end{table}
Table 4: Means, SDs, ANOVA, and Tukey HSD test results of eye performance.  
\begin{table}
\begin{tabular}{c c c c c c c} \hline \multicolumn{6}{c}{**Eye Movement Time**} \\ \hline  & **Level** & **Mean (s)** & **Group \({}^{\mathbf{a}}\)** & **SD** & **F\({}_{\mathbf{n,m}}\)** & \(p\)**-Value** \\ \hline \multirow{3}{*}{Environment} & 2D Screen Displays & 0.474 & A & 0.185 & \multirow{3}{*}{F\({}_{1,11}\) = 5.732} & \multirow{3}{*}{\(p\) = 0.036} \\  & 3D Stereoscopic Displays & 0.635 & B & 0.334 & \\ \hline \multirow{3}{*}{Depth} & 210 cm & 0.525 & A & 0.260 & \multirow{3}{*}{F\({}_{2,22}\) = 1.372} & \multirow{3}{*}{\(p\) = 0.385} \\  & 190 cm & 0.566 & A & 0.312 & \\ \cline{1-1}  & 140 cm & 0.571 & A & 0.269 & \\ \hline \multirow{6}{*}{ID} & 2.8 bits & 0.435 & A & 0.158 & \multirow{3}{*}{F\({}_{5,55}\) = 65.138} & \multirow{3}{*}{\(p\) = 0.001} \\  & 3.3 bits & 0.479 & B & 0.262 & \\ \cline{1-1}  & 3.7 bits & 0.594 & C & 0.247 & \\ \cline{1-1}  & 4.2 bits & 0.580 & C & 0.225 & \\ \cline{1-1}  & 5.1 bits & 0.540 & B, C & 0.305 & \\ \cline{1-1}  & 6.1 bits & 0.699 & D & 0.374 & \\ \hline \multicolumn{6}{l}{Environment \({}^{\star}\) Depth} & & & & \\ \hline \multicolumn{6}{l}{Environment \({}^{\star}\) ID} & & & & \\ \hline \multicolumn{6}{l}{Depth \({}^{\star}\) ID} & & & & \\ \hline \multicolumn{6}{l}{Environment \({}^{\star}\) Depth \({}^{\star}\) ID} & & & & \\ \hline \end{tabular}
\end{table}
Table 3: Means, SDs, ANOVA, and Tukey HSD test results of eye movement time.