diff --git a/Grade 10/Science/SNC2DZ/Unit 3: Physics.md b/Grade 10/Science/SNC2DZ/Unit 3: Physics.md
index da19c5c..8d856c2 100644
--- a/Grade 10/Science/SNC2DZ/Unit 3: Physics.md	
+++ b/Grade 10/Science/SNC2DZ/Unit 3: Physics.md	
@@ -168,4 +168,16 @@ $`M = \frac{h_{i}}{h_{o}} = -\frac{d_{i}}{d_{o}}`$
     - If positive, image is **upright and virtual**
     - If negative, image is **inverted and real**
     - If greater than 1, image is larger and farther from the optical centre than the object
-    - If less than 1, image is smaller and closer to the optical centre than the object
\ No newline at end of file
+    - If less than 1, image is smaller and closer to the optical centre than the object
+
+## Human eye
+ - `Iris`: Controls amount of light entering eye
+ - `Lens`: Focuses light to form an **inverted real** image at the back of the eye
+ - `Retina`: Captures **light** and converts it to **electrical signals**
+ - `Optic nerve`: Transports information from the **retina** to the **brain** for processing
+
+### Focusing problems
+ - `Myopia`: Near-sightedness
+ - `Hyperopia`: Far-sightedness
+ - `Presbyopia`: Far-sightedness due to aging
+ - `Astigmatism`: Blurry vision for everything
\ No newline at end of file