1. An ophthalmic progressive addition lens for a farsighted and presbyopic wearer, comprising:a lens which has a prescribed far vision mean refractive power greater or equal to plus 1 Diopter and a non nil prescribed addition, ADDp,

wherein said lens has a mean refractive power, PPO(?, ?), a module of resulting astigmatism, ASR(?, ?), an acuity loss value ACU(?, ?), where said (?, ?) functions are determined in as-worn conditions of the lens by the wearer, and a first acuity criterion, AcuityCriterion1 which fulfils following requirement:AcuityCriterion1?44D2.deg, and where:

D refers to Diopter, deg to degree, AcuityCriterion1 is defined as a combination of PPO(?, ?), ASR(?, ?), ADDp, and ACU(?, ?),

wherein said lens has a meridian line, ML(?, ?), a fitting cross, FC(?FC, ?FC), said (?, ?) functions being determined in as-worn conditions of the lens by the wearer for gaze directions (?, ?) joining the center of rotation of the eye, CRE, and the lens, where ? is a lowering angle in degree and ? is an azimuth angle in degree,

wherein:

the acuity loss value ACU(?, ?) is expressed in logMAR and defined according to following equation: ACU(?, ?)=?log(AC %(?, ?)/100,

wherein:

AC %(?, ?)=100?63×P(?, ?)?44.3×ASR(?, ?)÷7.2×P(?, ?)2+19.5×P(?, ?)×ASR(?, ?)+ASR(?, ?)2; when P(?, ?)?0,

AC %(?, ?)=100?44.3×ASR(?, ?)+ASR(?, ?)2; when P(?, ?)<0,

P(?, ?)=PPO(?, ?)?PPO(?, ?_?_mer),

?_?_mer is the value of the azimuth angle ? on the meridian line, ML(?, ?), at the lowering angle ?, and

wherein:

AcuityCriterion1=Numerator1/Denominator,

Numerator1=LAcuSub85(0.1)×LAcuAlpha85(0.1)×ADDp4,

Denominator=PeaksMean2×PVL2,

LAcuSub85(0.1) is the angular extent (in deg2) of the zone where ACU(?, ?)?0.1 logMAR, inside a circle, CIR, centered on (?, ?)=(12,0), which radius is 35 degrees, and where ???85%, ?85% being the lowering angle where 85% of the prescribed addition is perceived by the wearer on the meridian line,

LAcuAlpha85(0.1) is the acuity width (in deg) at ?85% between two iso-acuity loss lines corresponding to 0.1 logMAR and is equal to ?+(ACU(?85%, ?)=0.1)???(ACU(?85%, ?)=0.1), where ?+ is greater than ?_?_mer(?85%) and ?? is less than ?_?_mer(?85%),

PVL is the power variation length is expressed in deg and defined as being equal to (?85%??15%), ?15% being the lowering angle where 15% of the prescribed addition is perceived by the wearer on the meridian line, and

PeaksMean is the mean maximum module of resulting astigmatism (in Diopter,) which is equal to [ASRmax(?L, ?L)+ASRmax(?R, ?R)]/2, where ASRmax(?L, ?L) is the maximum module of resulting astigmatism on a side (left side) of the meridian line, and ASRmax(?R, ?R) is the maximum module of resulting astigmatism on the other side (right side) of the meridian line that are both determined inside a circle, CIR, centered on (?, ?)=(12,0), which radius is 35 degrees.