Please choose the correct ending to complete the given sentence: Health: [header] How to insert and remove a scleral lens [title] Make sure you are sitting down. [step] If you drop the lens while standing, it can shatter. [title] Make sure you are in a well-lit room.

Ending1: [step] The plunger you will use to insert the lens has a small hole in it. This hole can be used to get a sense of how you're lining up the lens with your eye. Ending2: [step] This will help to identify the lens problem in advance. Having a place with lots of shadows can also help guide the procedure. Ending3: [step] Especially if your sunglasses are owned or borrowed, exposure to natural light can damage their lenses. Keep your head and face covered and protected. Ending4: [step] Removing the lens can result in permanent damage to it. [title] Make sure that you are not wearing it.

Answer format: ending1/ending2/ending3/ending4