diff --git a/arrow-libs/optics/arrow-optics-ksp-plugin/src/main/kotlin/arrow/optics/plugin/OpticsProcessor.kt b/arrow-libs/optics/arrow-optics-ksp-plugin/src/main/kotlin/arrow/optics/plugin/OpticsProcessor.kt
index 63dac0b4695..7b3b72c23c5 100644
--- a/arrow-libs/optics/arrow-optics-ksp-plugin/src/main/kotlin/arrow/optics/plugin/OpticsProcessor.kt
+++ b/arrow-libs/optics/arrow-optics-ksp-plugin/src/main/kotlin/arrow/optics/plugin/OpticsProcessor.kt
@@ -6,6 +6,7 @@ import arrow.optics.plugin.internals.asFileText
 import arrow.optics.plugin.internals.join
 import arrow.optics.plugin.internals.noCompanion
 import arrow.optics.plugin.internals.otherClassTypeErrorMessage
+import arrow.optics.plugin.internals.qualifiedNameOrSimpleName
 import arrow.optics.plugin.internals.snippets
 import arrow.optics.plugin.internals.typeParametersErrorMessage
 import com.google.devtools.ksp.processing.CodeGenerator
@@ -33,19 +34,19 @@ class OpticsProcessor(private val codegen: CodeGenerator, private val logger: KS
   private fun processClass(klass: KSClassDeclaration) {
     // check that it is sealed or data
     if (!klass.isSealed && !klass.isData) {
-      logger.error(klass.simpleName.asString().otherClassTypeErrorMessage, klass)
+      logger.error(klass.qualifiedNameOrSimpleName.otherClassTypeErrorMessage, klass)
       return
     }
 
     // check that it does not have type arguments
     if (klass.typeParameters.isNotEmpty()) {
-      logger.error(klass.simpleName.asString().typeParametersErrorMessage, klass)
+      logger.error(klass.qualifiedNameOrSimpleName.typeParametersErrorMessage, klass)
       return
     }
 
     // check that the companion object exists
     if (klass.companionObject == null) {
-      logger.error(klass.simpleName.asString().noCompanion, klass)
+      logger.error(klass.qualifiedNameOrSimpleName.noCompanion, klass)
       return
     }
 
diff --git a/arrow-libs/optics/arrow-optics-ksp-plugin/src/main/kotlin/arrow/optics/plugin/internals/domain.kt b/arrow-libs/optics/arrow-optics-ksp-plugin/src/main/kotlin/arrow/optics/plugin/internals/domain.kt
index 89be73d75e9..61235678a14 100644
--- a/arrow-libs/optics/arrow-optics-ksp-plugin/src/main/kotlin/arrow/optics/plugin/internals/domain.kt
+++ b/arrow-libs/optics/arrow-optics-ksp-plugin/src/main/kotlin/arrow/optics/plugin/internals/domain.kt
@@ -4,10 +4,10 @@ import com.google.devtools.ksp.symbol.KSClassDeclaration
 import com.google.devtools.ksp.symbol.KSName
 import java.util.Locale
 
-data class ADT(val pckg: KSName, val el: KSClassDeclaration, val targets: List<Target>) {
-  val sourceClassName = el.qualifiedName?.asString() ?: el.simpleName
-  val sourceName = el.simpleName.asString().replaceFirstChar { it.lowercase(Locale.getDefault()) }
-  val simpleName = el.simpleName.asString()
+data class ADT(val pckg: KSName, val declaration: KSClassDeclaration, val targets: List<Target>) {
+  val sourceClassName = declaration.qualifiedNameOrSimpleName
+  val sourceName = declaration.simpleName.asString().replaceFirstChar { it.lowercase(Locale.getDefault()) }
+  val simpleName = declaration.simpleName.asString()
   val packageName = pckg.asString()
 
   operator fun Snippet.plus(snippet: Snippet): Snippet =
diff --git a/arrow-libs/optics/arrow-optics-ksp-plugin/src/main/kotlin/arrow/optics/plugin/internals/dsl.kt b/arrow-libs/optics/arrow-optics-ksp-plugin/src/main/kotlin/arrow/optics/plugin/internals/dsl.kt
index 9c412bb07e2..69cf6e992d2 100644
--- a/arrow-libs/optics/arrow-optics-ksp-plugin/src/main/kotlin/arrow/optics/plugin/internals/dsl.kt
+++ b/arrow-libs/optics/arrow-optics-ksp-plugin/src/main/kotlin/arrow/optics/plugin/internals/dsl.kt
@@ -3,21 +3,21 @@ package arrow.optics.plugin.internals
 fun generateLensDsl(ele: ADT, optic: DataClassDsl): Snippet =
   Snippet(
     `package` = ele.packageName,
-    name = ele.simpleName,
+    name = ele.sourceClassName,
     content = processLensSyntax(ele, optic.foci)
   )
 
 fun generateOptionalDsl(ele: ADT, optic: DataClassDsl): Snippet =
   Snippet(
     `package` = ele.packageName,
-    name = ele.simpleName,
+    name = ele.sourceClassName,
     content = processOptionalSyntax(ele, optic)
   )
 
 fun generatePrismDsl(ele: ADT, isoOptic: SealedClassDsl): Snippet =
   Snippet(
     `package` = ele.packageName,
-    name = ele.simpleName,
+    name = ele.sourceClassName,
     content = processPrismSyntax(ele, isoOptic)
   )
 
diff --git a/arrow-libs/optics/arrow-optics-ksp-plugin/src/main/kotlin/arrow/optics/plugin/internals/isos.kt b/arrow-libs/optics/arrow-optics-ksp-plugin/src/main/kotlin/arrow/optics/plugin/internals/isos.kt
index 8d03c00fd4a..40ef5656d2b 100644
--- a/arrow-libs/optics/arrow-optics-ksp-plugin/src/main/kotlin/arrow/optics/plugin/internals/isos.kt
+++ b/arrow-libs/optics/arrow-optics-ksp-plugin/src/main/kotlin/arrow/optics/plugin/internals/isos.kt
@@ -1,7 +1,7 @@
 package arrow.optics.plugin.internals
 
 internal fun generateIsos(ele: ADT, target: IsoTarget) =
-  Snippet(`package` = ele.packageName, name = ele.simpleName, content = processElement(ele, target))
+  Snippet(`package` = ele.packageName, name = ele.sourceClassName, content = processElement(ele, target))
 
 inline val Target.targetNames
   inline get() = foci.map(Focus::className)
diff --git a/arrow-libs/optics/arrow-optics-ksp-plugin/src/main/kotlin/arrow/optics/plugin/internals/lenses.kt b/arrow-libs/optics/arrow-optics-ksp-plugin/src/main/kotlin/arrow/optics/plugin/internals/lenses.kt
index 7b9057ece2e..db1c8a2381c 100644
--- a/arrow-libs/optics/arrow-optics-ksp-plugin/src/main/kotlin/arrow/optics/plugin/internals/lenses.kt
+++ b/arrow-libs/optics/arrow-optics-ksp-plugin/src/main/kotlin/arrow/optics/plugin/internals/lenses.kt
@@ -5,7 +5,7 @@ import java.util.Locale
 internal fun generateLenses(ele: ADT, target: LensTarget) =
   Snippet(
     `package` = ele.packageName,
-    name = ele.simpleName,
+    name = ele.sourceClassName,
     content = processElement(ele, target.foci)
   )
 
@@ -20,12 +20,22 @@ private fun String.toUpperCamelCase(): String =
       }
     )
 
-private fun processElement(ele: ADT, foci: List<Focus>): String =
+private fun processElement(adt: ADT, foci: List<Focus>): String =
   foci.joinToString(separator = "\n") { focus ->
     """
-  |inline val ${ele.sourceClassName}.Companion.${focus.lensParamName()}: $Lens<${ele.sourceClassName}, ${focus.className}> inline get()= $Lens(
-  |  get = { ${ele.sourceName}: ${ele.sourceClassName} -> ${ele.sourceName}.${focus.paramName.plusIfNotBlank(prefix = "`", postfix = "`")} },
-  |  set = { ${ele.sourceName}: ${ele.sourceClassName}, value: ${focus.className} -> ${ele.sourceName}.copy(${focus.paramName.plusIfNotBlank(prefix = "`", postfix = "`")} = value) }
+  |inline val ${adt.sourceClassName}.Companion.${focus.lensParamName()}: $Lens<${adt.sourceClassName}, ${focus.className}> inline get()= $Lens(
+  |  get = { ${adt.sourceName}: ${adt.sourceClassName} -> ${adt.sourceName}.${
+      focus.paramName.plusIfNotBlank(
+        prefix = "`",
+        postfix = "`"
+      )
+    } },
+  |  set = { ${adt.sourceName}: ${adt.sourceClassName}, value: ${focus.className} -> ${adt.sourceName}.copy(${
+      focus.paramName.plusIfNotBlank(
+        prefix = "`",
+        postfix = "`"
+      )
+    } = value) }
   |)
   |""".trimMargin()
   }
diff --git a/arrow-libs/optics/arrow-optics-ksp-plugin/src/main/kotlin/arrow/optics/plugin/internals/optional.kt b/arrow-libs/optics/arrow-optics-ksp-plugin/src/main/kotlin/arrow/optics/plugin/internals/optional.kt
index ea9c8b1b8d2..c03dfcd8bab 100644
--- a/arrow-libs/optics/arrow-optics-ksp-plugin/src/main/kotlin/arrow/optics/plugin/internals/optional.kt
+++ b/arrow-libs/optics/arrow-optics-ksp-plugin/src/main/kotlin/arrow/optics/plugin/internals/optional.kt
@@ -12,7 +12,12 @@ internal fun generateOptionals(ele: ADT, target: OptionalTarget) =
 private fun processElement(ele: ADT, foci: List<Focus>): String =
   foci.joinToString(separator = "\n") { focus ->
     fun getOrModifyF(toNullable: String = "") =
-      "{ ${ele.sourceName}: ${ele.sourceClassName} -> ${ele.sourceName}.${focus.paramName.plusIfNotBlank(prefix = "`", postfix = "`")}$toNullable?.right() ?: ${ele.sourceName}.left() }"
+      "{ ${ele.sourceName}: ${ele.sourceClassName} -> ${ele.sourceName}.${
+        focus.paramName.plusIfNotBlank(
+          prefix = "`",
+          postfix = "`"
+        )
+      }$toNullable?.right() ?: ${ele.sourceName}.left() }"
     fun setF(fromNullable: String = "") =
       "${ele.sourceName}.copy(${focus.paramName.plusIfNotBlank(prefix = "`", postfix = "`")} = value$fromNullable)"
 
diff --git a/arrow-libs/optics/arrow-optics-ksp-plugin/src/main/kotlin/arrow/optics/plugin/internals/prism.kt b/arrow-libs/optics/arrow-optics-ksp-plugin/src/main/kotlin/arrow/optics/plugin/internals/prism.kt
index 19bbaae8e88..77fa0b377d1 100644
--- a/arrow-libs/optics/arrow-optics-ksp-plugin/src/main/kotlin/arrow/optics/plugin/internals/prism.kt
+++ b/arrow-libs/optics/arrow-optics-ksp-plugin/src/main/kotlin/arrow/optics/plugin/internals/prism.kt
@@ -3,7 +3,7 @@ package arrow.optics.plugin.internals
 internal fun generatePrisms(ele: ADT, target: PrismTarget) =
   Snippet(
     `package` = ele.packageName,
-    name = ele.simpleName,
+    name = ele.sourceClassName,
     imports =
       setOf("import arrow.core.left", "import arrow.core.right", "import arrow.core.identity"),
     content = processElement(ele, target.foci)
diff --git a/arrow-libs/optics/arrow-optics-ksp-plugin/src/main/kotlin/arrow/optics/plugin/internals/processor.kt b/arrow-libs/optics/arrow-optics-ksp-plugin/src/main/kotlin/arrow/optics/plugin/internals/processor.kt
index 38e515bd371..27a0929ab4a 100644
--- a/arrow-libs/optics/arrow-optics-ksp-plugin/src/main/kotlin/arrow/optics/plugin/internals/processor.kt
+++ b/arrow-libs/optics/arrow-optics-ksp-plugin/src/main/kotlin/arrow/optics/plugin/internals/processor.kt
@@ -4,6 +4,7 @@ import arrow.optics.plugin.isData
 import arrow.optics.plugin.isSealed
 import com.google.devtools.ksp.processing.KSPLogger
 import com.google.devtools.ksp.symbol.KSClassDeclaration
+import com.google.devtools.ksp.symbol.KSDeclaration
 import com.google.devtools.ksp.symbol.KSType
 import com.google.devtools.ksp.symbol.KSTypeArgument
 import java.util.Locale
@@ -15,10 +16,10 @@ internal fun adt(c: KSClassDeclaration, logger: KSPLogger): ADT =
     c.targets().map { target ->
       when (target) {
         OpticsTarget.LENS ->
-          evalAnnotatedDataClass(c, c.simpleName.asString().lensErrorMessage, logger)
+          evalAnnotatedDataClass(c, c.qualifiedNameOrSimpleName.lensErrorMessage, logger)
             .let(::LensTarget)
         OpticsTarget.OPTIONAL ->
-          evalAnnotatedDataClass(c, c.simpleName.asString().optionalErrorMessage, logger)
+          evalAnnotatedDataClass(c, c.qualifiedNameOrSimpleName.optionalErrorMessage, logger)
             .let(::OptionalTarget)
         OpticsTarget.ISO -> evalAnnotatedIsoElement(c, logger).let(::IsoTarget)
         OpticsTarget.PRISM -> evalAnnotatedPrismElement(c, logger).let(::PrismTarget)
@@ -44,11 +45,14 @@ internal fun evalAnnotatedPrismElement(
         )
       }
     else -> {
-      logger.error(element.simpleName.asString().prismErrorMessage, element)
+      logger.error(element.qualifiedNameOrSimpleName.prismErrorMessage, element)
       emptyList()
     }
   }
 
+internal val KSDeclaration.qualifiedNameOrSimpleName: String
+  get() = (qualifiedName ?: simpleName).asString()
+
 internal fun KSClassDeclaration.sealedSubclassFqNameList(): List<String> =
   getSealedSubclasses().mapNotNull { it.qualifiedName?.asString() }.toList()
 
@@ -88,11 +92,11 @@ internal fun evalAnnotatedIsoElement(element: KSClassDeclaration, logger: KSPLog
         .zip(element.getConstructorParamNames(), Focus.Companion::invoke)
         .takeIf { it.size <= 22 }
         ?: run {
-          logger.error(element.simpleName.asString().isoTooBigErrorMessage, element)
+          logger.error(element.qualifiedNameOrSimpleName.isoTooBigErrorMessage, element)
           emptyList()
         }
     else -> {
-      logger.error(element.simpleName.asString().isoErrorMessage, element)
+      logger.error(element.qualifiedNameOrSimpleName.isoErrorMessage, element)
       emptyList()
     }
   }
diff --git a/arrow-libs/optics/arrow-optics-ksp-plugin/src/test/kotlin/arrow/optics/plugin/LensTests.kt b/arrow-libs/optics/arrow-optics-ksp-plugin/src/test/kotlin/arrow/optics/plugin/LensTests.kt
index fc44c0b60fd..d913d5006a2 100755
--- a/arrow-libs/optics/arrow-optics-ksp-plugin/src/test/kotlin/arrow/optics/plugin/LensTests.kt
+++ b/arrow-libs/optics/arrow-optics-ksp-plugin/src/test/kotlin/arrow/optics/plugin/LensTests.kt
@@ -38,14 +38,13 @@ class LensTests {
   fun `Lenses which mentions imported elements`() {
     """
       |$imports
-      |import kotlin.time.Duration
       |
       |@optics
-      |data class OpticsTest(val time: Duration) {
+      |data class OpticsTest(val time: kotlin.time.Duration) {
       |  companion object
       |}
       |
-      |val i: Lens<OpticsTest, Duration> = OpticsTest.time
+      |val i: Lens<OpticsTest, kotlin.time.Duration> = OpticsTest.time
       |val r = i != null
       """.evals("r" to true)
   }
diff --git a/arrow-libs/optics/arrow-optics-ksp-plugin/src/test/kotlin/arrow/optics/plugin/Utils.kt b/arrow-libs/optics/arrow-optics-ksp-plugin/src/test/kotlin/arrow/optics/plugin/Utils.kt
index 01ba04b72c7..2ca7093e4c7 100644
--- a/arrow-libs/optics/arrow-optics-ksp-plugin/src/test/kotlin/arrow/optics/plugin/Utils.kt
+++ b/arrow-libs/optics/arrow-optics-ksp-plugin/src/test/kotlin/arrow/optics/plugin/Utils.kt
@@ -6,6 +6,7 @@ const val imports =
       import arrow.optics.*
       import arrow.optics.dsl.*
       import arrow.optics.typeclasses.*
+      import kotlin.time.Duration.Companion.hours
       """
 
 const val dslModel =
@@ -19,7 +20,7 @@ const val dslModel =
     @optics data class Company(val name: String, val address: Address) {
       companion object
     }
-    @optics data class Employee(val name: String, val company: Company?) {
+    @optics data class Employee(val name: String, val company: Company?, val weeklyWorkingHours: kotlin.time.Duration = 5.hours) {
       companion object
     }
     @optics data class Employees(val employees: List<Employee>) {