Yes, it is normal to observe a reflection of your iris, cornea, and even the structure of your retina (including rods and cones) when light hits your glasses at certain angles. These reflections occur due to the interaction between light and the surfaces of your glasses, as well as the positioning of your eyes and the lenses.
When light passes through the lenses of your glasses, it can be reflected off the front and back surfaces of the lenses, creating glare or reflections. If the angle of incidence and reflection is just right, you may see a circular or oval-shaped glare in the corner of your glasses. This glare can sometimes capture the reflection of your eyes, including the structures like the iris, cornea, and the pattern of rods and cones on the retina.
The visibility of these reflections can vary depending on factors such as the curvature of the lenses, the position of your eyes relative to the glasses, and the lighting conditions. Additionally, the type of lens coatings or anti-reflective treatments on your glasses can also affect the intensity and appearance of reflections.
Overall, seeing a reflection of your iris, cornea, and the structures within your eyes when light hits your glasses in a particular way is a normal phenomenon and is a result of the interaction of light with the surfaces and structures involved.