Near vision

Near Vision & Accommodation

Show only the near-vision task in use.

Working Distance

Dioptric demand and estimated near addition.

Inputs

Accommodative demand

2.50 D

At 40 cm (0.4 m)

Estimated near addition

+0.50 D

Using Hofstetter average amplitude

Calculation

  1. 0140 cm = 0.4 m
  2. 02Demand = 1 / 0.4 = 2.50 D

Calculated reference. Final near addition and accommodation findings require clinical verification.

Formulas

  1. 01Demand (D) = 1 / working distance (m)
  2. 02Hofstetter average = 18.5 − 0.3 × age
  3. 03Estimated Add = Demand − (Amplitude / 2)

Clinical note

Hofstetter values are population references, not prescriptions. Confirm amplitude and binocular findings clinically.

OptiX Pro provides mathematical calculations, reference information, and fitting assistance. It does not replace professional clinical examination, manufacturer fitting guidelines, or professional judgement. Contact lens selection and prescription must be clinically verified.