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power 4dOptical power is also referred to as dioptric power, convergence power, refractive power, or refractive power. It is equal to P = 1 f. Dioptre Formula . The Dioptre formula is used toDisclaimer: 4D88 is a 4D results site, we never sell 4D, Government licensed lottery are legal in Malaysia, Cambodia & Singapore, Only buy from government approved 4D operator. 4D88 do