How do you find the near point of convergence?

Measure the near point of convergence (NPC). The examiner holds a small target, such as a printed card or penlight, in front of you and slowly moves it closer to you until either you have double vision or the examiner sees an eye drift outward.

What is meant by near point of convergence?

Near point of convergence (NPC) – is the point where the visual axes intersect under the maximum effort of the convergence. It is a measure of pursuit convergence. A qualitative assessment of the convergence quality of fixation jumps from distant to the near target point.

What is the normal NPC in adults?

Normal NPC varies slightly from patient to patient, but is usually less than 10 cm from the nose. Conversely, in CI, the NPC can be increased to 30 cm or more (von Noorden 2002 and Wright et al. 1995). To measure the NPC, the patient fixates on a small target at near.

What is NPA and NPC?

Testing for Near Point of Accommodation (NPA) Testing for Near Point of Convergence (NPC) 1 2.

How do you measure near Point?

Near point of accommodation “Push Up Test”: For this test, use relatively small letters (0.4M or 0.5M) to help better control accommodation. Slowly move these letters closer to the eye until they become blurry. Measure the distance the letters became blurry. This is the near point of accommodation.

What is RAF rule?

The RAF Rule is a 50 cm long rule with a slider holding a rotating four-sided cube, each side with a different target. The first has a vertical line with a central dot for convergence fixation. The others provide a limited number of lines of near reading examples.

How do you measure near point?

What is near point accommodation?

Near Point Accommodation Rule is the point closest to the bridge of the nose where convergence and binocular single vision can no longer be maintained as an object approaches.

What is the normal near point?

A normal eye is considered to have a near point at about 11 cm (4.3 in) for a thirty year old. The near point is highly age dependent (see accommodation). A person with hyperopia or presbyopia would have a near point that is farther than normal.

What is RAF ruler?

Product description. RAF Rule (Royal Air Force Rule) provides a binocular gauge to measure Objective and Subjective Convergence as well as Accommodation in 1 mm increments. The RAF Rule consists of a 50 cm long rule with a slider holding a rotating four-sided cube.

What is far and near point?

1 likes. Hint:The far point of the eye refers to the distance at which the eye can clearly see objects. And the eye’s near point is the shortest distance between the object and the eye at which it may be seen clearly without strain.