vision - The Eye • Skip accessory structures, go right to...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: The Eye • Skip accessory structures, go right to eyeball • 3-layered structure (layers called TUNICS) • Hollow inside, divided into two large spaces (CAVITIES) (Filled with Aqueous Humor) (Filled with (Filled with Vitreous Humor) Vitreous Humor) 1. 3. 2. Lens The Eye Items to note: 1. Cornea 2. Iris / Pupil 3. Lens 4. Ciliary Body 5. Optic disc 6. Optic nerve Vision Part 1: Focusing Light • To reach retina, light passes through the: – Cornea – Aqueous humor – Lens – Vitreous humor • Cornea and lens focus focus light onto the retina – Air/water interface at cornea bends light (refraction) – Lens dynamically adjusts its shape to fine-tune focus (accommodation) Vision Part 1: Focusing Light • Accommodation by lens – For objects far away , ciliary muscles relaxed , lens flat flat – For objects up close , ciliary muscles contracted , lens round round Vision Part 1: Focusing Light • Problems with light focusing nearsighted nearsighted farsighted farsighted Eyeball too long Eyeball too long or or Cornea too round Cornea too round Eyeball too short Eyeball too short or or Cornea too flat Cornea too flat Vision Part 1: Focusing Light • LASIK – Laser Assisted In Situ Keratomileusis – Precise method of reshaping cornea to correct...
View Full Document

This note was uploaded on 04/05/2009 for the course BIOL 252 taught by Professor Johnson during the Spring '07 term at UNC.

Page1 / 20

vision - The Eye • Skip accessory structures, go right to...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online