Visual Fixation in NBA Free-Throws and the Relationship to On-Court Performance

Main Article Content

Daniel Laby


vision, basketball, fixation



Although hitting a baseball is often described as the most difficult task in all of sports, shooting baskets during a game likely ranks a close second. Previous studies have described the role of vision in basketball and more specifically a concept termed the “quiet eye” has been shown to be related to basketball performance. How a shooter visualizes the target, how consistent their visual fixation is, and how long they maintain that fixation has been correlated to shooting success. Although the majority of previous reports have included non-professional basketball shooters, we evaluated NBA (National Basketball Association) players to determine if this skill was significant at the professional level.

Materials and Methods

We evaluated 16 professional NBA players prior to the 2018-2019 NBA season. All players shot 30 consecutive free-throws while wearing Tobii Pro eye-tracking glasses. Following the completion of the task, several metrics were calculated including shooting success rate, as well as four measures of the position and duration of ocular fixation just prior to, during, and immediately after ball release for each shot of each player. Additionally, player performance statistics from the 2018-2019 season were recorded and compared to the visual fixation data. Descriptive statistics as well as correlations between the visual fixation metrics and on-court performance metrics were calculated.


NBA shooters averaged a 79% success rate in free throw shooting (SD = 14%, min = 56%, max=100%) during the study. Moderate statistically significant correlations were found between the percentage of successful free throws and the four measures of visual fixation (r=0.539 to 0.687). In addition, visual fixation measures were found to be corelated with on-court metrics suggesting that shooters who had more frequent, as well as longer, fixations on the rim where more likely to have lower USG%, and ORB% as well as higher FG3%. The percentage of successful shots in the study was compared to the on-court FT% and found to be moderately correlated (r=0.536).


The need to maintain ocular fixation on the rim as one shoots seems elementary, but in fact varies greatly among NBA players, as noted in these results. Our data suggests that players who visually fixate longer and more frequently on the rim are more likely to be successful in free throws, as well as more successful in 3-point goals. Likely due to their likely distance from the basket, they do not make as many offensive rebounds. This data set appears to describe basketball guards in contrast to forwards/centers and supports previous research on non-professional basketball players.

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1. Vickers JN. Visual control when aiming at a far target. J Exp Psychol Hum Percept Perform 1996; April; 22(2): 242–54.
2. Oudejans RRD, van de Langenberg RW, Hutter RI. 2002. Aiming at a far target under different viewing conditions: Visual control in basketball jump shooting. Human Movement Sci 2002; 21:457–80.
3. Zwierko T, Popowczak M, Wozniak J, Rokita A. Visual control in basketball shooting under exertion conditions. J Sports Med Phys Fitness 2018 Oct, 58(10):1544–53.
4. Wilson MR, Webb A, Wylie LJ, Vine SJ. The quiet eye is sensitive to exercise-induced physiological stress. Prog Brain Res 2018;240:35–52.
5. Klostermann A, Panchuk D, Farrow D. Perception-action coupling in complex game play: Exploring the quiet eye in contested basketball jump shots”. J Sports Sci 2018 May;36(9):1054–60.
6. Fischer L, Rienhoff R, Tirp J, et al. Retention of quiet eye in older skilled basketball players. J Mot Behav 2015;47(5):407–14.
7. Harle SK, Vickers JN. Training quiet eye improves accuracy in the basketball free throw. Sport Psychol 2001;15:289–305.
8. Vine SJ, Wilson MR. The influence of quiet eye training and pressure on attention and visuo-motor control. Acta Physiologica 2011;136(3):340–6.
9. Vickers JN, Vandervies B, Kohut C, Ryley B. Quiet eye training improves accuracy in basketball field goal shooting. Prog Brain Res 2017; 234:1–12.
10. Mangine GT, Hoffman JR, Wells AJ, et al. Visual track-ing speed is related to basketball-specific measures of performance in NBA players. J Strength Condit Res 2014;28(9):2406–14.