Our eyes are window of our soul. Through time, you have seen many experiences; whether the occurences are yours or others. These memories would possibly be captured as cellular memories in your cells. As one of the human senses, this window would need healing and maintenance. Healing it allow you to let go and housekeep your wellbeing.
One of the efficient way to clear your vision that influences your physical, emotional, mental and spiritual level is by gently massaging the frame of your eyes (excluding the eye balls) using a crystal ball. 
1) Select a 15-25 mm diameter crystal ball.
2) Recite an intention to clear it and use of its utmost healing properties to assist / heal you
3) Place the crystal ball on your palm and place it against the frame of your eye. Slowly glide / rub as you encircle the muscles and soft bones of your eyes. Do not apply too much pressure, energy healing is of no relation with applying pressure and causing more pain. No oilments are required
4) Duration of massage recommended approximately 10 minutes for both eyes.
What's the difference between using crystal as compared to others elements or materials (e.g. finger, wood)?
Crystal brings with it more clearing and restoration healing properties depending on your selection of crystal.
Can I use other shape crystals?
Yes, as long as you feel comfortable and the shape does not incur pain.
[Healing your Eye Balls]
Eye balls are sensitive and fragile, you may use other energy healing method to heal it. For instance, you may close your eyes and gently cup your palms on them and recite an intention to heal.
.... I ask for all obselete energies, memories, tension, tiredness and all that does not serve the purpose of my higher self to be demolecular and transmuted to Mother Gaia. (Imagine a cloud of energy or lights disintegrate and dissolve as though all that you no longer need is likewise removed)
I ask for purification and restoration of all suitable healing attributes to heal my eyes improving it to a greater level of awareness. (Imagine a warm comfortable white golden light merging into your eyes healing all its sensory cells)
Once you are done, gently remove your palms and open both your eyes
