## 3 Results
### Ocular Symptoms and Signs at Six Months after LASIK
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Pearson r** & **OSDI** & **NRS** & **sf-MPQ** & **NPSI-Eye** & **DEQ5** \\ \hline OSDI & \(r=1\) & \(r=0.12\) & \(r=0.26\) & \(r=0.20\) & \(r=0.34\) \\  & \(p=0.45\) & \(p=0.11\) & \(p=0.22\) & \(p=0.03\) \\ \hline NRS & & \(r=1\) & \(r=0.56\) & \(r=0.68\) & \(r=0.38\) \\  & & \(p<0.0005\) & \(p<0.0005\) & \(p=0.01\) \\ \hline sf-MPQ & & \(r=1\) & \(r=0.75\) & \(r=0.20\) \\  & & & \(p<0.0005\) & \(p=0.22\) \\ \hline NPSI-Eye & & & \(r=1\) & \(r=0.28\) \\  & & & \(p=0.08\) \\ \hline DEQ5 & & & & \(r=1\) \\ \hline \hline \end{tabular}  
* OSDI = Ocular Surface Disease Index; NRS = Numerical Rating System for average ocular pain over one week recall; sf-MPQ = Short Form McGill Pain Questionnaire; NPSI-Eye = Neuropathic Pain Symptom Inventory Modified for the eye; DEQ5 = Dry Eye Questionnaire 5.  
\end{table} 
Table 4: Relationships Between Ocular Symptom Score Questionnaire. \begin{table}
\begin{tabular}{c c c c} \hline \hline  & **Pregabalin** & **Control** & \(p\)**-Value** \\ \hline Number (n) & 21 & 21 & \\ \hline Eye symptoms & & & \\ \hline DEQ5, mean (SD), range 0-22 & 6.6 (5.0) & 4.5 (4.2) & 0.14 \\ \hline DEQ5, mild symptoms \(\geq\)6, \(n\) (\%) & 12 (57\%) & 7 (33\%) & 0.12 \\ \hline DEQ5, severe symptoms \(\geq\)12, \(n\) (\%) & 4 (19\%) & 1 (5\%) & 0.34 \\ \hline Change in DEQ5 from baseline, mean (SD) & 1.1 (3.9) & 0.1 (3.6) & 0.42 \\ \hline OSDI, mean (SD), range 0-100 & 12.6 (15.0) & 12.3 (16.8) & 0.96 \\ \hline Change in OSDI from baseline, mean (SD) & -0.30 (14.4) & 2.9 (15.9) & 0.51 \\ \hline Ocular pain, worst over one week recall, mean (SD), range 0-10 & 1.38 (1.75) & 0.76 (1.38) & 0.21 \\ \hline Ocular pain, average over one week recall, mean (SD), range 0–10 & 1.10 (1.48) & 0.38 (0.97) & 0.08 \\ \hline Intensity of burning over one day recall, mean (SD), range 0–10 & 0.43 (0.87) & 0.62 (1.28) & 0.58 \\ \hline Any burning pain, \(n\) (\%) & 5 (24\%) & 5 (24\%) & 1.00 \\ \hline Intensity of wind sensitivity one day recall, mean (SD), range 0–10 & 1.00 (1.95) & 0.57 (0.93) & 0.37 \\ \hline Any sensitivity to wind, \(n\) (\%) & 7 (33\%) & 7 (33\%) & 1.00 \\ \hline Intensity of light sensitivity one day recall, mean (SD), range 0–10 & 0.48 (1.25) & 0.86 (1.49) & 0.38 \\ \hline Any sensitivity to light, \(n\) (\%) & 4 (19\%) & 8 (38\%) & 0.17 \\ \hline NPSI-Eye total, mean (SD), range 0–100 & 2.81 (4.07) & 3.14 (5.85) & 0.83 \\ \hline Eye signs \({}^{*}\) & & & \\ \hline Inflammatory score \(\geq\)2, \(n\) (\%) & 2 (10\%) & 4 (20\%) & 0.66 \\ \hline Inflammatory positive, \(n\) (\%) & 10 (50\%) & 7 (35\%) & 0.34 \\ \hline TBUT, seconds, mean (SD) & 8.35 (2.46) & 9.05 (5.93) & 0.62 \\ \hline Corneal staining, mean (SD) & 2.43 (2.58) & 2.05 (1.94) & 0.59 \\ \hline Schirmer score, mm wetting, mean (SD) & 15.45 (8.17) & 15.05 (8.64) & 0.88 \\ \hline \hline \end{tabular}  
* SD = Standard deviation, DEQ5 = Dry Eye Questionnaire 5, OSDI = Ocular Surface Disease Index, sf-MPQ = short form McGill Pain Questionnaire, NPSI-Eye = Neuropathic Pain Symptom Inventory for the eye; \({}^{*}\) Unless indicated, value from more severely affected eye used in analysis.  
\end{table} 
Table 3: Ocular symptoms and signs at six months post-LASIK, by treatment assignment.