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  • 2020–2021 BCSC Basic and Clinical Science Course™

    Go to Academy Store Learn more and Purchase.

    3 Clinical Optics

    Introduction: Quick-Start Guide to Optics and How to Refract

    Part 2: How to Refract

    Step 8: Refraction at Near

    Refracting at near (ie, determining the optimal correction, if any, needed for near vision) is not routinely done on patients younger than 40 years of age unless they have a specific near-vision complaint:

    1. Begin with the current distance correction in place in the phoropter or trial frame. If you do not know the distance refraction with confidence, perform a careful distance refraction even if the patient volunteered no complaints at distance.

      This step is critical to detect latent hyperopia.

      Converge the phoropter, so that the optics point toward the near eye chart—use the 2 small levers just below the top of the instrument (Figure I-29). Install the near eye chart on the stick and holder provided for near work at a working distance of 40 cm (Figure I-30). (The multipanel “Rotochart” provided with the phoropter is excellent for near-vision testing. The “Rosenbaum card” also works well.) If this is not available, the patient can hold a near-vision testing card at the appropriate distance. Be sure to provide suitable illumination.

    2. Add plus sphere power over the distance correction until near acuity is optimized, with the zone of clear vision centered at 40 cm, or at the patient’s preferred reading distance. (Check this by sliding or moving the near card toward and away from the patient.)

      Rough near-point “add” guidelines according to age are as follows: 40 years: +1.00 D to +2.00 D; 50 years: +1.50 D to +2.50 D; 60 years and older: +2.00 D to +2.75 D.

    Patients frequently prefer higher adds. Try to resist this bias—the higher adds not only require that text be held unnaturally close to the eyes but also decrease the range over which the material can be seen clearly. This decreased range of comfortable reading positions hastens fatigue during reading.

    Figure I-29 Converging the phoropter. (Notice the position of the small vertical levers near the top; compare Figure I-23.)

    (Courtesy of Scott E. Brodie, MD.)

    Figure I-30 Phoropter with near-point chart in place at distance 40 cm.

    (Courtesy of Scott E. Brodie, MD.)

    When in doubt, chose the lesser add. It should rarely be necessary to use an add greater than +2.75 D, except as a low-vision aid.

    Corrected acuity at near should roughly correspond to the same Snellen fraction as the distance acuity. (A significant discrepancy, in either direction, suggests the presence of ocular pathology.)

    Excerpted from BCSC 2020-2021 series : Section 3 - Clinical Optics. For more information and to purchase the entire series, please visit https://www.aao.org/bcsc.

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