难得糊涂 Or...

 To help the retina to heal afterwards,

Retinoschisis Degenerative 905-31 Hz

Retinoschisis Degenerative 722-70 Hz

Retinoschisis Degenerative 493-20 Hz

Retinoschisis Degenerative 165-80 Hz

Retinoschisis Degenerative 50-00 Hz

Better to see clearly...

Retinal Detachment 834-25 Hz

Retinal Detachment 796-50 Hz

Retinal Detachment 665-75 Hz

Retinal Detachment 452-50 Hz

Retinal Detachment 327-50 Hz

Retinal Detachment 217-50 Hz

and inch closer...