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Abstract
The depth of focus (DOF) was measured and compared objectively in free space and subjectively in Badal optical space in 10 young adults. The mean total objective DOF was ±0.59 ±0.10 D, with a range from ±0.46 D to ±0.75 D. The mean total subjective DOF was ±0.63 ±0.22 D, with a range from ±0.37 D to ±0.96 D. The objective and subjective DOF values were not significantly different. However, response variability was greater [∼2×] in the subjective test mode. Similarity between the objective and subjective results suggests that blur plays a dominant role in this process, which is in agreement with earlier experiments and model predictions under normal closed-loop viewing conditions.