An objective assessment of the effect of fogging on accommodation

The effect on accommodation of using plus lenses to fog an eye that is viewing a distant target has been measured with an infrared autorefractor. Sixteen subjects were used; eight hyperopes and eight myopes. There is no difference between the results for the two refractive groups. Intersubject variation did occur; some subjects remained relaxed as the amount of fog was increased, other subjects relaxed initially and then began to accommodate. The data indicate that up to 2 D of fogging can occur before accommodation begins to return to its resting state.