A pinhole 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. In this way, 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 pinh
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| - Stenopäische Lücke (de)
- Agujero estenopeico (es)
- Trou sténopéïque (fr)
- Pinhole occluder (en)
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| - El agujero estenopeico es un instrumento de diagnóstico en oftalmología y optometría . El artículo es técnicamente un oclusor con un agujero pequeño en el centro de 1 a 1.5 mm de diámetro, el cual se coloca delante del ojo del paciente mientras el otro se ocluye por completo, esto hace que el circulo de mínima confusión que esta en la retina disminuya de diámetro y que por ende mejore la agudeza visual. Si en el proceso de toma de la agudeza visual de un paciente la misma mejora mirando a través de dicho agujero, estaríamos frente a un error refractivo (miopía, hipermetropía, etc.); en caso contrario, nos encontraríamos probablemente frente otros diagnósticos no refractivos: patológicos y hasta quizá enfermedades sistémicas. (es)
- Die stenopäische Lücke (von altgriechisch στενός stenós „eng“ sowie dem Adjektiv ὀπαῖος opaios „mit einem Loch versehen“) ist ein in der Augenheilkunde und Augenoptik verwendetes Hilfsmittel zur differentialdiagnostischen Beurteilung einer verminderten Sehschärfe. Sie besteht in der Regel aus einer runden, undurchsichtigen Kunststoffscheibe von etwa drei Zentimetern Durchmesser, welche in der Mitte mit einem runden, 1–2 Millimeter großen Loch versehen ist. (de)
- A pinhole 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. In this way, 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 pinh (en)
- Le trou sténopéïque est un dispositif servant de pupille artificielle pour les tests de mesure d'acuité visuelle. Il s'agit en général d'une spatule percée d'un ou plusieurs trous de 0,75 à 2 mm de diamètre. (fr)
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| - Pinhole occluder in ophthalmic trial lens set (en)
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| - Pinhole occluder is used to estimate the improvement in visual acuity, evaluate potential visual acuity in cataract etc. (en)
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| - El agujero estenopeico es un instrumento de diagnóstico en oftalmología y optometría . El artículo es técnicamente un oclusor con un agujero pequeño en el centro de 1 a 1.5 mm de diámetro, el cual se coloca delante del ojo del paciente mientras el otro se ocluye por completo, esto hace que el circulo de mínima confusión que esta en la retina disminuya de diámetro y que por ende mejore la agudeza visual. Si en el proceso de toma de la agudeza visual de un paciente la misma mejora mirando a través de dicho agujero, estaríamos frente a un error refractivo (miopía, hipermetropía, etc.); en caso contrario, nos encontraríamos probablemente frente otros diagnósticos no refractivos: patológicos y hasta quizá enfermedades sistémicas. (es)
- Die stenopäische Lücke (von altgriechisch στενός stenós „eng“ sowie dem Adjektiv ὀπαῖος opaios „mit einem Loch versehen“) ist ein in der Augenheilkunde und Augenoptik verwendetes Hilfsmittel zur differentialdiagnostischen Beurteilung einer verminderten Sehschärfe. Sie besteht in der Regel aus einer runden, undurchsichtigen Kunststoffscheibe von etwa drei Zentimetern Durchmesser, welche in der Mitte mit einem runden, 1–2 Millimeter großen Loch versehen ist. (de)
- Le trou sténopéïque est un dispositif servant de pupille artificielle pour les tests de mesure d'acuité visuelle. Il s'agit en général d'une spatule percée d'un ou plusieurs trous de 0,75 à 2 mm de diamètre. On place le trou sténopéique devant l'œil avec une baisse d'acuité visuelle ce qui permet de restreindre les rayons de lumière au centre de la cornée où la réfraction n'est pas aussi critique. Si l'acuité visuelle ne s'améliore pas ou diminue, il s'agit possiblement d'une d'amblyopie ou d'une autre pathologie oculaire; si l'acuité visuelle s'améliore, il s'agit d'un problème réfractif : myopie ou hypermétropie. (fr)
- A pinhole 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. In this way, 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 pinhole 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. Squinting and looking through a tiny hole made with a finger works similarly to a pinhole 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 pinholes is mounted on an eyeglass frame and worn as pinhole glasses. Differential diagnosis:
*
* pinhole worsen vision: Macular diseases, central lens opacities
* Vision static with pinhole: Amblyopia (en)
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