Sistema óptico: refracción Flashcards

1
Q

Tipos de lentes

A

Positivo: convergente
Negativo: divergente

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2
Q

Acomodación

A

Por el cristalino
- Convergencia: contracción m. rectos internos
- Miosis: contracción esfínter pupilar
- Contracción músculo ciliar: aumento convexidad cristalino

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3
Q

Emetropía

A

Rayos de luz en retina

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4
Q

Miopía

A

Rayos de luz enfocados antes de la retina
Lejos= mal/ cerca= bien

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5
Q

Causas miopía

A

Ojo más grande, córnea, cristalino c/ mayor graduación

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6
Q

Hipermetropía

A

los rayos de luz después de la retina
Ojo más pequeño
lejos= b/ cerca= mal

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7
Q

tx miopía

A

Lentes divergentes

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8
Q

tx hipermetropía

A

Lentes convergentes/convexos

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9
Q

Astigmatismo

A

curva anormal de córnea
Se producen dos puntos focales

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10
Q

Presbicia

A

Cambio/rigidez cristalino
Dificultad para enfocar un objeto cercano

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