JCX-001 Ophthalmic visual function examination box, adjustable measuring ruler, four point lamp, hidden oblique meter, fusion oblique eye position detection

JCX-001 Ophthalmic Visual Function Examination Box

Your All-in-One Solution for Comprehensive Vision Assessment

The JCX-001 Ophthalmic Visual Function Examination Box is a complete, professional-grade toolkit designed to streamline a wide range of vision tests. Ideal for optometrists, ophthalmologists, and vision care centers, this portable system consolidates everything you need for efficient and accurate examinations into one compact, organized case.

What's Inside – Everything You Need, Ready to Go

Our thoughtfully curated set includes 12 essential components to cover diverse testing scenarios:

• Precision Measurement Tools: Adjustable measuring rulers (with four interchangeable cards) and a set of hidden inclinometers for accurate axis and angle assessments.
• Advanced Binocular & Depth Perception Tests: A four-hole light set (with battery and charger) and a set of three 3D stereoscopic test boards (complete with a folding ruler) enable thorough evaluation of stereoacuity and spatial vision.
• Portable & Child-Friendly Options: A pen light for pupillary and anterior segment exams, plus two dedicated children's visual acuity scales to make testing easier and more engaging for young patients.
• Versatile Trial & Correction Aids: Five adjustable flipper prisms (ranging from 0.5 to 2.5) offer flexible options for phoria and vergence testing. A set of 5 vision test cards (with 10 total faces) ensures a varied and challenging assessment.
• Specialized Diagnostic Accessories: Red-green glasses, a dominant eye plate, a vision card holder, and a standard vision chart round out the set, providing solutions for color vision testing, ocular dominance determination, and reliable acuity measurements.

Why Choose the JCX-001 Examination Box?

• Complete & Integrated: No need to purchase separate components. This single case equips your practice with all the fundamental tools for visual function screening, saving you time and money.
• Professional Quality: Built with durability and accuracy in mind, each instrument is crafted for consistent, reliable performance in daily clinical use.
• Efficient & Organized: The custom-fitted carrying case keeps all items secure and easy to find, streamlining your workflow and protecting your investment.
• Suitable for All Ages: With tools designed for both adults and children, this set is a versatile asset for any vision care practice.

Optimize your eye exams. Enhance your diagnostic capability. Order the JCX-001 Ophthalmic Visual Function Examination Box today and elevate the standard of care you provide.

Visual Function Examination Manual

Note: Spelling and medical terminology have been corrected from the original OCR text.

Part 1: Binocular Vision Function Examination Items

Part 2: Worth 4-Dot Test Results Interpretation

Results observed by the patient:

1. One red and two green, with white or yellow below
2. Two red and two green
3. Two red
4. Two red and three green
5. One red and three green
6. One red and two green — the white below is half red and half green
7. Three green

Interpretation:

1. Dominant Eye:

• (1) If the patient reports ①, ②, and ⑦, it indicates that the subject has no distinction between dominant and non-dominant eyes.
• (2) If the patient reports ③ and ⑤, then the right eye is the dominant eye.
• (3) If the patient reports ④ and ⑥, then the left eye is the dominant eye.

2. First-Level Simultaneous Vision: If the patient reports ⑤ and ⑥, it indicates that the tested individual does not have the ability to perform first-level simultaneous vision.

3. Second-Level Fusion Vision: If the patient reports ⑦, it indicates that the subject has first-level simultaneous vision but does not have second-level fusion vision. If the patient reports ①, ②, ③, and ④, it indicates that the subject has both first-level simultaneous vision and second-level fusion vision.

Part 3: Heterophoria Tester (Maddox Rod)

1. Usage: This instrument is mainly used to check the degree of heterophoria and the prism of heterophoria in the human eye. (Adding a single prism can expand the examination range.) It is one of the instruments for diagnosing abnormal eye position.

2. Technical Parameters: Examination range: 0–20 prism diopters. Each grid value is 1 prism diopter.

3. Operation Method: Before use, reset to zero. After the patient's refractive error is completely corrected in both eyes, focus both eyes simultaneously on a point light source (pen lamp) located at a distance of approximately 40 cm and 5 m in front. Then place the instrument in front of the right eye, observe the point light source through the instrument, and directly observe the point light source with the left eye. If the dots and lines overlap, there is no heterophoria; otherwise, heterophoria is present. At this point, turn the small handwheel until the dots and lines coincide, and then read the value on the reading ring. The value read is the degree of heterophoria prism to be checked.

(1) Examination of Vertical Heterophoria

After resetting the instrument to zero, place the instrument in a vertical position with the stripe groove of the connecting rod in front of the right eye. At this point, the right eye sees a horizontal red bright light, and the left eye sees a light source spot. (See Figure 1 — Left Eye Right Heterophoria / Left Eye Left Heterophoria.) Above (or below) the bright red light, as shown in Figures 1 and 2, are the left eye right heterophoria and left eye left heterophoria. Rotate the handwheel to align the dots and lines, and then read the heterophoria value on the reading ring.

(2) Examination of Horizontal Heterophoria (Esophoria / Exophoria)

After the instrument is divided and zeroed, place the instrument in front of the right eye according to the horizontal position of the Maddox rod stripe groove. At this time, what the right eye sees is a vertical red bright light, and what the left eye sees is a light source spot. If the dots and lines overlap, it indicates no heterophoria. Same as esophoria and exophoria. If the red bright light line is to the right of the light point, there is esophoria; if the red bright light line is to the left of the light point, there is exophoria. Rotate the small handwheel to make the dots and lines overlap; then read on the reading ring.

Figure 1: Left Eye Right Heterophoria

Figure 2: Left Eye Left Heterophoria

Esophoria / Exophoria

Part 4: PRA Test (Positive Relative Accommodation)

Restore the lenses to the basic state of both eyes before the NRA examination, and once again ensure that the patient's visual acuity is clear. Add negative lenses in front of both eyes, increasing by −0.25 D each time, until the patient reports that the visual acuity continues to blur. Record the total amount of negative lenses added, which is the amount of positive relative accommodation (PRA) for the patient. The normal value of PRA is −1.75 to −3.00. In fact, PRA reflects the reserve power of accommodation; the larger the absolute value, the better. If PRA is small (low absolute value), it indicates insufficient accommodative power, accommodative insufficiency or ineffective accommodation, which can lead to accelerated myopia in adolescents and children, while adults are more prone to visual fatigue.

Part 5: Progressive Multifocal Glasses Evaluation

First, place the target 1 centimeter in front of the eyes, then gradually pull the target further away until you can see the small cross at the center of the target clearly. Measure the distance between the eyes and the target, which is the closest distance between the eyes and the target.

• (1) If the near point exceeds 20 centimeters, it indicates that the current near vision has been impaired, and it is recommended to wear progressive lenses.
• (2) The optometrist can calculate the required ADD (near addition) based on the proximity: ADD = 1 / distance (in meters).

Part 6: BCC Test (Accommodative Response)

When a certain accommodative stimulus is given, the human eye will make a corresponding accommodative response, which can be divided into accommodative lead, accommodative lag, and normal accommodative response according to whether the response is accurate.

The subject undergoes full correction at a distance of 40 centimeters using a near point card BCC (or FCC) visual aid (crosshair), with close pupillary distance and both eyes open. A ±0.50 D cross cylinder is added and the subject is asked to focus on the crosshair under dim lighting. The patient is asked to report which group of lines is clearer. If the patient reports that the vertical lines are clearer, the illumination level is reduced; if the patient still reports clearer vertical lines, they can flip the ±0.50 D cross cylinder and inquire again. If the patient still reports clearer vertical lines, stop the test and record the vertical line preference: increase the lens power of both eyes at a rate of +0.25 D until the patient reports that both lines are equally clear, and record the total amount of added lenses as the result of BCC. If the total amount of added lenses is positive, it indicates accommodative lag; if the total amount of added lenses is negative, it indicates accommodative lead. The normal reference value for BCC is +0.25 D to +0.50 D (for non-presbyopic patients).

Part 7: Near Point of Convergence (NPC)

Measure the subject wearing habitual prescription glasses. Gradually move the target from 40 cm or further towards the subject (moving at a speed of 3–5 cm per second), observing the subject's eyes, until one eye of the subject is observed to deviate from the target of gaze, or the subject reports seeing two images, and record the distance as the convergence break point. Move the target away from the subject until the subject is observed to return to the convergence state, or when the subject reports a change from double image to single image, record the distance as the convergence recovery point. The normal value of the break point is 5 cm.

Part 8: Worth 4-Dot Test (Detailed Description)

1. Examination Principle: This examination method applies the principle of red-green color complementarity. Colored filters complement the red and green colors of the four-dot light. The eye wearing the red lens cannot see green, only red, and white is also perceived as red; the eye wearing the green lens cannot see red, only green, and white is also perceived as green. Thus, the right eye can only see two red lights and one white light (all appearing red), and the left eye can only see three green lights (all appearing green).

2. Operation Method:

• (1) Complete correction of refractive error in the subject. The examinee wears red and green glasses (according to ophthalmic convention, the right eye is red and the left eye is green).
• (2) The examiner holds the four-dot light and instructs the examinee to observe the red and green lights of the four-dot light at 40 cm, 1 m, 3 m, and 6 m, and report the number and color of the lights seen. The patient will report the following situations:
  1. One red and two green, with white or yellow below
  2. Two red and two green
  3. Two red
  4. Two red and three green
  5. One red and three green
  6. One red and two green — the white below is half red and half green
  7. Three green

Part 9: Stereopsis Test Cards

1. Usage: This test card set is used to check binocular stereo vision function. It is composed of three test cards with different depths. Each card is printed with four patterns, one of which is a three-dimensional image.

2. Examination Method:

1. First, teach the subject how to perform the test by placing the thickest test card 30 cm in front of them, allowing them to observe and point out which of the four patterns is different (protruding or concave).
2. At the beginning of the examination, the thinnest test card should be used, and the subject should point out the three-dimensional image among the four patterns on the test card. If the subject's stereo function is normal, they can quickly and accurately recognize this pattern and be able to tell whether it is protruding or concave.
3. If the card with the thickest depth cannot be identified, move to the next thinner card until the tested person can quickly and accurately identify or cannot recognize it.
4. Measure the distance between the eyes and the test card, and quantify the stereo acuity using the reference table (100 seconds of arc is normal).
5. For example, if the subject can recognize the stereo image in the thinnest test card within a range of 150 cm, the stereo acuity is the highest (5 seconds of arc); if the subject identifies the stereo image in the thickest test card within a range of 30 cm, their stereo acuity is the lowest (600 seconds of arc).

3. Precautions: During testing, the test card should be placed against a white background for observation. During the test, the subject's line of sight should be perpendicular to the plane of the test card, and attention should be paid to not moving the head up, down, left, or right when observing. The surface of the test card should be kept clean and free from friction and scratches.

Part 10: Stereopsis Acuity Reference Table

Part 11: Dominant Eye Test Card and Near Point Ruler

1. How to Use the Dominant Eye Test Card: Examination of the dominant eye. Instruct the examinee to straighten their arms, raise the dominant eye test card, view distant targets through the holes in the card, and then close both left and right eyes. If the distant target disappears after closing one eye, then that eye is the dominant eye.

2. Usage of the Near Point Ruler (Visual Scale):

1. Color cartoon visual aids: Used to guide children's gaze when checking eye position.
2. Suppression screening in eye exams: The examinee wears right red and left green glasses. If the report shows R is clear, it indicates left eye suppression; on the contrary, the right eye is suppressed.
3. Near-use red and green three-point visual aids: The examinee wears right red and left green glasses. If the green dots are not visible in the report, the left eye is suppressed; if the red dots are not visible, the right eye is suppressed.
4. Accommodation amplitude test visual target: Wearing corrective glasses for single-eye observation, it is best to focus on the line of the visual target on the near point ruler, and push the visual target towards the eye at a constant speed starting from 40 cm. Until the examinee expresses that the visual target is blurry, read the distance on the measuring ruler at this time. Record the distance from the visual target to the cornea when the subject reports blur, and convert it into the accommodation amplitude according to the formula (refer to the method of using the accommodation ruler).

Part 12: Flipper Lens (Plus/Minus Flipper)

1. Functional Principle: The flipper lens is composed of two groups of lenses with the same refractive power, one plus and one minus. The training of accommodative sensitivity is achieved through the instantaneous flipping between plus and minus lenses, which has the same mechanism as the instantaneous focusing of the eyes.

2. Purpose: To check the accommodative sensitivity of one eye and both eyes.

3. Operation Method:

1. The patient's refractive error has been completely corrected.
2. Choose a flipper lens with a ±2.00 D specification for training.
3. Place the flipper lens in front of one or both eyes, read the 20/30 size E-shaped vision card, and before training, first place the +2.00 D lens in front of the eyes. Start timing from −2.00 D, flip from −2.00 D to +2.00 D, and then flip back to −2.00 D as one cycle. The number of cycles can be determined by dividing the number of lines read by 2.
4. Record the number of cycles in which the patient flips within one minute. The normal sensitivity for single-eye accommodation is 11 cycles, and the normal sensitivity for both eyes is 8 cycles.

Part 13: Near Point Ruler (Accommodation Ruler)

1. Function: The adjustable ruler is used for more convenient detection of visual function data and determination of abnormal ranges. The principle of accommodation amplitude quantification: When in the accommodative static state, the common focal point of the macular fovea is the far point of accommodation of the eye. The distance from the far point to the axial plane of the principal point of the eye (1.35 mm behind the cornea) is the distance to the far point of accommodation. The reciprocal of the distance to the far point is the near point of accommodation of the eye, and the distance from the near point to the axial plane of the principal point of the eye is the distance to the near point of accommodation.

2. Operation Method:

1. Method of Accommodation Near Point Detection: Completely correct refractive error, cover the left eye, test the right eye, fix the visual acuity dial at 40 cm, and make the patient focus on the top row of the best visual acuity on the near visual acuity chart. Slowly move closer to the patient until the visual acuity is blurred, and record the distance, which is the patient's accommodation near point.
2. Accommodation Amplitude Detection Method: Under the premise of complete correction of distance vision, focus on the 0.6 visual target, gradually move closer from 40 cm at a speed of 1 cm per second until the visual target blurs, then move back one step to make the visual target clear. At this time, the reciprocal of the distance between the visual target and the cornea is the accommodation amplitude. Open both eyes, repeat, and check the accommodation amplitude of both eyes. For example, if blurring starts at 10 cm in front of the eye, the reciprocal of the distance (0.1 m) is 10 D. Record: ( ) OS: ( ) OU: ( )
3. PRA/NRA Detection Method: Positive and Negative Relative Accommodation (PRA/NRA) refers to the ability to increase or decrease the accommodative ability when the patient's convergence remains unchanged in the binocular fixation state. The determination of NRA/PRA is helpful for the analysis of binocular vision function.

Negative Relative Accommodation (NRA): Completely correct refractive errors, fix the visual acuity chart at 40 cm, instruct the patient to focus on the line of visual acuity at the best visual acuity to ensure clear vision, add positive lenses in front of the eyes, increasing by +0.25 D each time, until the patient reports that the visual acuity continues to blur (because negative relative accommodation is a relaxation exercise and positive relative accommodation is a stimulation exercise), and record the total amount of positive lenses added. The normal value of NRA is 1.75 to 2.25. This is determined by the working distance used during the examination.