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Measuring Your Blind Spot Introduction Seeing is believing. See for yourself that you have a blind spot. Then measure it! Concepts • Blind spot (optic disk) • Lens • Retina • Similar triangles Background The lens in the front of the eye focuses images on the retina in the back of the eye. In the retina, the image impulses are converted to
Next, demonstrate how the brain fills in the blind spot by drawing a line through the center of the dot and continuing through the center of the X (slide 7). Measure the Blind Spot Tell students to use the Blind Spot Lab Notebook to document data (slide 8). To measure the blind spot: Hold the card 25 cm from your face. Close your left eye.
blind spot. When you have several marks, connect the marks to form a circle. 6. Then, draw a line through the center of the circle and measure it as the diameter. MEASURE YOUR BLIND SPOT BY YOURSELF MEASURE YOUR BLIND SPOT WITH A PARTNER 1. Hold the card at arm’s length. 2. Have your partner measure the distance from the card to your eye. 3.
blind spot. When you have several marks, connect the marks to form a circle. 6. Then, draw a line through the center of the circle and measure it as the diameter. MEASURE YOUR BLIND SPOT BY YOURSELF MEASURE YOUR BLIND SPOT WITH A PARTNER 1. Hold the card at arm’s length. 2. Have your partner measure the distance from the card to your eye. 3.
- Background
- Introduction
- Blind Spot Assessment
- To Complete The Examination…
A physiological blind spot exists in all healthy individuals due to the lack of photoreceptor cells in the area where the optic nerve emerges through to the retinal plane (optic nerve head / optic disc). In day-to-day life, the brain does an excellent job of reducing our awareness of the blind spot by using information from other areas of the retin...
Wash your hands and don PPEif appropriate. Introduce yourself to the patient including your name and role. Confirm the patient’s name and date of birth. Briefly explain what the examination will involve using patient-friendly language. Gain consentto proceed with the examination. Position the patient sitting on a chair. Ask if the patient has any p...
1. Sit directly opposite the patient, at a distance of around 1 metre. 2. Ask the patient to cover one eye with their hand. 3. If the patient covers their right eye, you should cover your left eye (mirroring the patient). 4. Ask the patient to focus on part of your face (e.g. nose) and not move their head or eyes during the assessment. You should d...
Explain to the patient that the examination is now finished. Thank the patientfor their time. If mydriatic drops were instilled, remind the patient they cannot drive for the next 3-4 hoursuntil their vision has returned to normal. Dispose of PPE appropriately and wash your hands. Summariseyour findings
- Dr Lewis Potter
Finding your blind spot can be a challenge for many students. Here we put forward a simple way to understand WHAT your blind spot is, and why it is vital to ...
- 8 min
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- Dr James Gill
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The width of the blind spot, w, is given by . w r (2 – 1), where. r. is the distance between the retina and the optical center of the cornea-crystalline lens combination. Measuring the Diameter of Your Blind Spot Vol. 37, Sept. 1999 T. HE. P. HYSICS. T. EACHER. 349. For. d = 12 cm, the averages (found for a group of about 12 stu-dents) for ...
