TruForm Optics

Extended Keratometer Range

A +1.25D or -1.00D diagnostic lens can be held adjacent to the front of the keratometer to extend the dioptric range of the drum readings

Extended Keratometer Range with +1.25D Lens		Extended Keratometer Range with -1.00D Lens
Actual Drum Reading	Extended Value	Actual Drum Reading	Extended Value
45.00D	52.46D	36.00D	30.87D
45.25D	52.76D	36.25D	31.09D
45.50D	53.05D	36.50D	31.30D
45.75D	53.34D	36.75D	31.51D
46.00D	53.63D	37.00D	31.73D
46.25D	53.92D	37.25D	31.95D
46.50D	54.21D	37.50D	32.16D
46.75D	54.51D	37.75D	32.37D
47.00D	54.80D	38.00D	32.59D
47.25D	55.09D	38.25D	32.80D
47.50D	55.38D	38.50D	33.02D
47.75D	55.67D	38.75D	33.23D
48.00D	55.96D	39.00D	33.45D
48.25D	56.25D	39.25D	33.66D
48.50D	56.55D	39.50D	33.88D
48.75D	56.84D	39.75D	34.09D
49.00D	57.13D	40.00D	34.30D
49.25D	57.42D	40.25D	34.52D
49.50D	57.71D	40.50D	34.73D
49.75D	58.00D	40.75D	34.95D
50.00D	58.30D	41.00D	35.16D
50.25D	58.59D	41.25D	35.38D
50.50D	58.88D	41.50D	35.59D
50.75D	59.17D	41.75D	35.81D
51.00D	59.46D	42.00D	36.02D