Near Visual Acuity for the CPOA Exam

Visual AssessmentCPOA

Near visual acuity (NVA) measures how clearly a patient sees at close range, typically 14 to 16 inches (35 to 40 cm). This is the working distance for reading, writing, using a phone, and most occupational close-up tasks. Testing near acuity separately from distance acuity helps identify conditions such as presbyopia, accommodative insufficiency, and macular disease.

Near Acuity Test Cards

Near acuity is tested using a near point card (or near card), which displays text or optotypes in progressively smaller sizes. The card is held at the standard near testing distance of 14 to 16 inches (35 to 40 cm) from the eyes.

Near acuity is expressed in several notations:

Jaeger (J) notation: The traditional system using J numbers. J1 is fine print (equivalent to approximately 20/20 near acuity or normal newspaper print). Larger J numbers represent larger print (J14 or J16 corresponds to very large print). The Jaeger scale is not standardized across all cards, making comparison between different products inconsistent.
M notation: A standardized metric system where 1M corresponds to print that subtends the same angle as a 20/20 optotype at 1 meter. Reading at 40 cm with 1M print is equivalent to 20/20 near. Higher M values (1.5M, 2M) represent larger print.
20/xx near notation: Some cards use Snellen-equivalent notation (e.g., 20/25 at near).

J1 near acuity (or equivalent) at 14 to 16 inches with appropriate reading correction is the goal for near tasks. A patient with 20/20 distance acuity who cannot read J3 at near likely has an uncorrected reading prescription or early macular disease affecting near function disproportionately.

Testing Procedure

Test the right eye first, then the left, then both eyes together.
The patient wears their near correction (reading glasses or contact lenses) if they have one. For patients without near correction, test in their distance correction or without correction if none.
Hold the near card at the standard testing distance (or ask the patient to hold it at their comfortable reading distance, then measure that distance).
Instruct the patient to read the smallest print they can see clearly.
Record the result and the correction worn.

Distance vs. Near Acuity: Clinical Significance

Differences between distance and near acuity provide diagnostic clues:

Distance Acuity	Near Acuity	Likely Cause
Good (20/20 cc)	Poor	Presbyopia, undetected near add needed, macular disease
Poor	Good	Myopia (nearsightedness) without correction; patient is accommodating to compensate
Both poor	Both poor	Media opacity (cataract), optic nerve disease, macular degeneration
Both good	Both good	Normal vision

Presbyopia and Near Acuity

Presbyopia is the age-related loss of accommodation that begins to affect near vision typically around age 40 to 45. As the crystalline lens hardens and loses elasticity, the ciliary muscle can no longer change lens shape adequately for close focus. Patients with presbyopia need a reading add in their glasses to supplement their distance correction for near work.

Near acuity testing is the primary tool for identifying the extent of presbyopia and the appropriate add power needed.

Key Takeaways

Near acuity is tested at 14 to 16 inches using a near card; common notations include Jaeger (J), M, and 20/xx.
J1 (or equivalent) at the standard near distance is the goal for normal near acuity.
Test each eye separately, then both together; note the correction worn.
Presbyopia is the most common cause of reduced near acuity in patients over 40; near acuity testing quantifies the deficit and guides add power selection.
Discrepancy between distance and near acuity provides important diagnostic information about the type and location of visual dysfunction.

Frequently Asked Questions

What is Jaeger notation and what does J1 mean?

Jaeger notation (J followed by a number) is a traditional near acuity measurement system using numbered print sizes on a near card. J1 represents fine print, equivalent to approximately 20/20 near acuity and comparable to standard newspaper or book print. Lower J numbers correspond to finer print; higher J numbers (such as J10, J14) represent larger, easier-to-read print. The Jaeger scale is not perfectly standardized across different manufacturers' cards, which is a limitation when comparing values across different clinical settings. The M notation system is considered more standardized.

At what age does presbyopia typically begin and why?

Presbyopia typically becomes symptomatic between ages 40 and 45, though lens stiffening begins much earlier. The crystalline lens grows throughout life as new fiber cells are added concentrically, compressing the central nucleus. By the mid-40s, the nucleus has hardened enough that the ciliary muscle can no longer effectively change the lens curvature for near focus. Patients notice difficulty reading small print at their habitual distance, often initially managed by holding reading material farther away. Progressive loss of accommodation continues until the mid-50s, when essentially no accommodation remains and a full reading correction is needed.

What does it mean when a patient has poor near acuity but good distance acuity?

Good distance acuity with poor near acuity suggests either presbyopia (the most common cause in patients over 40), an insufficient near add in their current glasses, or early macular disease that affects fine detail vision at close range. In younger patients, poor near acuity with good distance acuity may indicate accommodative insufficiency (the ciliary muscle is underperforming), which can cause eye strain, headache, and difficulty sustaining near focus. A careful history of age, onset, and associated symptoms helps distinguish these causes.

Why is near acuity tested at 14 to 16 inches rather than a different distance?

The standard near testing distance of 14 to 16 inches (35 to 40 cm) approximates the typical comfortable reading distance for most adults. Testing at this standard distance ensures that near acuity values are comparable across patients and clinical settings. If a patient holds the card at a different distance (farther for presbyopia, closer for myopia), the apparent acuity changes because the angular size of the optotypes changes. When a patient habitually reads at a non-standard distance, it is informative to document their preferred reading distance alongside the near acuity result.

What is the clinical significance of a patient with good distance acuity who cannot read J3 at near?

A patient with 20/20 distance acuity who cannot read J3 near print (moderately fine print) at 14 to 16 inches likely has either presbyopia requiring an add, or early macular disease preferentially affecting central fine-detail near vision. If the patient is under 40, consider accommodative insufficiency. If the patient is over 40 and does not have a reading correction, a near add trial will likely improve their near acuity significantly. If near acuity remains poor despite adequate near add correction, further evaluation for macular disease (OCT, dilated fundus exam) is warranted.