Search query: pinhole glasses

Product: Ophthalmic Eye Occluder with 14 Holes for Ophthalmologists, Orthoptists and Optometrists to Eye Exam
Brand: Medarchitect
Color: Black
Relevance: Exact
➤ What is the hole occluder?

A hole occluder is an opaque disk with one or more small holes through it, used by ophthalmologists, orthoptists and optometrists to test visual acuity. The occluder is a simple way to focus light, as in a pinhole camera, temporarily removing the effects of refractive errors such as myopia. Because light passes only through the center of the eye's lens, defects in the shape of the lens (errors of refraction) have no effect while the occluder is used.

➤ What does the hole occluder do?

The ophthalmologist, orthoptist or optometrist can estimate the maximum improvement in a patient's vision that can be attained by lenses to correct errors of refraction. This can be used to distinguish visual defects caused by refractive error, which improve when the occluder is used, from other problems, which do not. The hole occluder can also be used in testing visual acuity in mydriatic patients. In this case the pinhole occluder compensates for the inability to contract the iris assisting the eye in obtaining a retinal projection similar to that of a non-cycloplegic eye.

➤ How to use?

Squinting and looking through a tiny hole made with a finger works similarly to a hole occluder, by blocking light through the outer parts of the eye's lens. An improvised pinhole has a similar but better effect. The same principle has also been applied as an alternative to corrective lenses: a screen of holes is mounted on an eyeglass frame and worn as pinhole glasses.

➤ Differential diagnosis :

pinhole worsen vision: Macular diseases, central lens opacities

Vision static with hole: Amblyopia
Multiple hole occluder flipper made of high impact resistant plastic. Can be sterilized with any non-solvent based germicide.
Occluder is suitable for patients of any age, even children catch on quickly.
Occluder is a versatile tool, it provides so many features for Ophthalmic and Optometric exams.
Various color options to choose from: black & blue & purple.
【Customer Satisfaction Guarantee】If you are not 100% satisfy with the purchase for any reason, don't hesitate to contact us to request a refund or replacement.

Product: 10 Foot Brock String - Vision Convergence Training Tool - Train Vision, Improve Strength & Athletic Performance, and More!
Brand: Brock String
Color: White
Relevance: Irrelevant
This Brock String is 10 feet in length and is great for sports vision training, convergence insufficiency training, and more! Click 'Add to Cart' Now!
10 Foot Brock String
Convergence Insufficiency Trainer
Sports Vision Training
5 Tightly Fitted Beads on High Quality String
Instructions Included