Tactile Acuity

The ability to perceive and discriminate fine spatial details through the sense of touch, analogous to visual acuity for sight. Tactile acuity varies across body regions, with fingertips having the highest resolution at approximately 1-2mm spacing. In the context of accessibility and tactile graphic design, understanding tactile acuity is critical for determining appropriate line weights, symbol sizes, spacing between elements, and overall graphic complexity so that tactile materials can be accurately read by touch.