AIM: to evaluate the perimetric variations after photorefractive keratectomy (PRK) by means Frequency Doubling Perimetry (FDP). METHODS: 11 patients (16 eyes) that underwent PRK for myopia (mean SE: -5. 16D +/- 2.2D), divided in two groups according to myopia (8 eyes with myopia >6D, 8 eyes with myopia <6D). We evaluated the variation of contrast sensitivity (CS) by means of FDP preoperatively, after 2 weeks and 6 months. The FDP threshold was divided into four zones, which were: the center area (Z1), the 10° field area (Z2), the 20° field area (Z3) and the 30° lateral field area (Z4). RESULTS: After 6 months CS did not show any variation in all fields (Z1: p=0.77, Z2: p=0.057, Z3: p=0.1 and Z4: p=0.68). The variation of the CS was indirectly correlated to the entity of the myopic amount at any level of visual field (correlation p<O.O5). Eyes with higher myopia showed a variation in CS only in Z2 (p=0.044), the remaining showed significant variation in Z3 (p=0.0003). Z1 field showed significant difference at 15 days post-op (p=0.02). Z2 showed differences before surgery (p=0.009) and after 15 days (p=0.006). Z3 showed a constant difference during all the follow-up (p=0.008, p=0.004 and p=0.022). Z4 did not show any difference at the beginning (p=0.27) and after 6 months (p=0.84), anyway there was a significant difference after 15 days (p<0.0001). CONCLUSIONS: FDP after PRK reveals a temporary reduction of CS, that come back to normal after 6 months.